Nitro Car and Truck Option Parts

These are all of the option parts that are available for our Nitro RS4 car and truck kits. Click on the highlighted lines to see pictures of each part.

Also see our full parts lists for:

HPI Nitro Engines

Shock Tuning Springs

Spur Gears

Part # Description

Price

914 1 Nitro Start-Up Set (120v) 
This Nitro Start-Up Set includes HPI 20% Power Fuel, HPI Nitro Car Cleaner, a conveniently sized 250cc fuel bottle, rechargeable glow plug igniter with overnight wall charger, 4-way glow plug wrench, plus a spare glow plug and washer for a low price, all in one convenient package.

$62.00

1436
1
Aluminum Heat Sink Head (Purple/11 Fin)

45.00

1438
1
"Chubby" Aluminum Heat Sink Head

30.00

1502 1

Glow Plug Medium R3
Packaged 12 per card, price is per plug.

6.00 ea

1503 1 Glow Plug Medium Cold R4
Packaged 12 per card, price is per plug.

6.00 ea

1504 1 Glow Plug Cold R5
Packaged 12 per card, price is per plug.

6.00 ea

1507 1 Turbo Glow Plug Medium Cold R7
Packaged 12 per card, price is per plug.

6.00 ea

1508 1 Turbo Glow Plug Cold R8
Packaged 12 per card, price is per plug.

6.00 ea

1634 1 Carburetor (SS) (Complete)  
Rotary carb, two needle adjustments, 5.5mm carb! Fits the 15FE and 12E engines.

53.00

1666 1 Carburetor (SS) (Complete)  
Two needle adjustments, 5.5mm carb! Fits 15SS and 15SC engines, black case.

53.00

1687 1 Carburetor (SC) (Complete)  
Two needle adjustments, large bore carb! Fits the 15SS and 15SC engine cases. For instructions how to install this, click here

55.00

1702 1 Heat Sink Head For Nitro Star 12  
Provides more cooling, great custom looks! Fits Nitro Star 12E engine only.

45.00

1703 1 Heat Sink Head for Nitro Star 15 (Purple)  
All hardware included to make conversion. Lets engine run cooler longer. Purple anodizing matches purple chassis perfectly! Fits Nitro Star 15FE engines.

45.00

1727 1 Aluminum Heat Sink Head (Purple/7 Fin/15FE)
The new heat sink head for the Nitro Star 15FE engine is purple anodized machined aluminum for cool looks and great cooling!
28.00
1890 1 Exhaust Pipe and Manifold Set
Dual-chamber design features trick accents like full polishing, etched HPI Oval logo, spring attachments for the pipe to the header, cooling fins for the header connection and a spring to attach the header to any rear-exhaust .21 engine. An extra spring can be used to hold the header on for an extra-secure connection. This pipe is made in Italy for HPI by Novarossi. Designed for on-road .21 engines

140.00

6272 1 Bumper Plate (RS4 Sedans)  
Woven graphite plate keeps precut foam bumpers in place and looks great. Not for RS4 Mini, RS4 MT, Nitro RS4 MT or Super Nitro RS4. See it installed here.

8.00

6273 1 Foam Spacer for Foam Bumper (8pcs)
Eight self-sticking foam spacers to custom-fit your foam bumper to the body you use. Keeps the body in the correct shape at high speeds. Click here to see an example of the spacers on a car. Click here to see an example of the spacers fitted under a body.

4.00

6274 1 Precut Foam Bumper Gray (RS4 Sedans)

5.00

6275 1 Precut Foam Bumper Blue (RS4 Sedans)

5.00

6277 1 Foam Bumper (Super Nitro RS4)  
Includes aluminum hardware for secure installation. Thick foam protects the body and chassis!

8.00

6590 2 Option Spring 14x80x1.1 17 Coils (Yellow / 2pcs.)
for MT 2

6.00

6593 2 Option Spring 14x80x1.1 15 Coils (Blue / 2pcs.)
for MT 2

6.00

6594 2 Option Spring 14x80x1.1 14 Coils (Purple / 2pcs.)
for MT 2

6.00

6763
2
Shock Spring 13 x 20 x 1.7mm x 6.5 coils (Silver/2 pcs) (Front)
for R40

4.00

6767 2 Shock Spring 13 x 20 x 1.7mm x 5.5 coils (Gold/2 pcs) (Front)
for R40
4.00
6773 2 Shock Spring 13 x 23 x 1.6mm x 6.5 coils (Silver/2 pcs) (Rear)
for R40
4.00
6777 2 Shock Spring 13 x 23 x 1.6mm x 5.5coils (Gold/2 pcs) (Rear)
for R40
4.00
6823 5 Silicone O-Ring 4.5mm x 6.6mm (5 pcs)
Seals the connection of the gear diff and diff driveshaft/outdrive. Used only for gear diffs.

2.00

7115 3 Touring Car Rear Wing Set
Three wings in different widths (175mm, 185mm, 195mm) for use on any wide or narrow touring car body, molded in thick, tough 0.040" polycarbonate! Three sets of side plates are included to fine-tune the wing for long or tight tracks. A special "Gurney Flap" is molded into each wing for extreme rear downforce, and the thickness of the wing prevents the wing from being deformed at high speeds. This is a great "secret weapon" for touring car racers! See the wing profile here.

10.00

9043 4 Quick Tire Holders (Gray)
The easy and convenient way to organize your tires! Holds 4 touring car/Super/Mini tires or two truck/rear buggy tires. Spring-loaded retainers make it easy to attach tires and don't damage the axle holes. Tags let you record tire compound and insert type. 4 Quick Tire Holders included in each package.

5.00

9044 4 Quick Tire Holders (Purple)
See above for details.

5.00

9045 4 Quick Tire Holders (Red)
See above for details.

5.00

9046 4 Quick Tire Holders (Blue)
See above for details.

5.00

9047 4 Quick Tire Holders (Yellow)
See above for details.

5.00

9062 1 HPI Nitro Car Cleaner
Degrease your car or truck, and blast dirt and gunk off parts. Leaves no residue and evaporates quickly. Also useful for cleaning electric motors.

6.00

9067 1 HPI Fuel Bottle
Marked in 100 milliliter increments, holds .5 liters of fuel. Purple anodized fueling tip with rubber stopper and o-ring to seal leaks. Has the HPI Oval logo molded into it!

15.00

9072 1 Receiver Protector Small (Orange)  
Fits all mini or micro-size receivers. Includes velcro tape for easy attachment and removal. Have an HPI sticker on them, and a dimple that can be cut out for an antenna hole. Protects against fuel spills, water and dirt. 42mm x 27mm x 23mm high, or 1" x 1.6" x 1.8" high
5.00
9073 1 Receiver Protector Small (Black)  
See above for details.
5.00
9074 1 Receiver Protector Small (Purple)
See above for details.
5.00
9075 1 Receiver Protector Large (Orange)  
Fits all standard-size receivers. Includes velcro tape for easy attachment and removal. Have an HPI sticker on them, and a dimple that can be cut out for an antenna hole. Protects against fuel spills, water and dirt. 45mm x 30mm x 30mm high, or 1.75" x 1.25" x 1.25" high
5.00
9076 1 Receiver Protector Large (Black)
See above for details.
5.00
9077 1 Receiver Protector Large (Purple)
See above for details.
5.00
9084 1 HPI Curved Scissors  
Cuts through R/C polycarbonate bodies easily, and is curved for extra convenience.
12.00
33405 1 Heat Sink Engine Aluminum Mount (R40)
New for the ROAR National Champion HPI R40 nitro sedan are Heat Sink Aluminum Engine Mounts.

40.00

33406 1 Diff Gear Set (R40 4 Bevel Gear)
This set has the 4 bevel gear modification, which makes the car more stable under hard acceleration.

32.00

33407 1 Aluminum Hex Hub Clamp Type (6mm/4pcs)
These are official HPI factory option parts, designed to the exact car dimensions and team tested for maximum performance.

32.00

72016 1 Stainless Steel Hinge Pin Set (Super Nitro RS4)  
Provides smoother suspension action than stock screw pins, and are much more durable.
17.00
72017 1 Aluminum Front Bulkhead Set (Purple)
Fits on nearly all RS4 series cars, except electric and Nitro RS4 MT.  All screws necessary for installation are included. Will not fit the Pro 3.
AVAILABLE EXCLUSIVELY AT BUY HPI!
40.00
72018 1 Aluminum Rear Bulkhead Set (Purple)
Fits on nearly all RS4 series cars, including electric RS4 MT, Mini cars and all Nitro cars. All screws necessary for installation are included. Will not fit the Pro 3.
AVAILABLE EXCLUSIVELY AT BUY HPI!
40.00
72031 2 Aluminum Front Hub Carriers (Purple / fits Pro/Sport 2, RTR, Nitro 2, Racer 2, Super) 
Strengthens the front end of your car significantly. Fits all kits with the Pro 2 Front Suspension. Includes set screws for hinge pins and screws/nuts for camber links. Will not fit the Pro 3.
AVAILABLE EXCLUSIVELY AT BUY HPI!
33.00
72036 4 Aluminum Hex Hub Clamp Type (6mm / 4pcs)  
Purple anodized for great looks, these are stronger than plastic hex hubs, and won't fall off your axles or get stuck in your wheels! 6mm wide: Super Nitro RS4 and RS4 Mini owners will need to use 1mm spacers to maintain the same wheel offset.
AVAILABLE EXCLUSIVELY AT BUY HPI!
20.00
72040 2 Aluminum Rear Hub 1.5 Degree
Provides more steering for all RS4 series cars than stock 2 degree hubs. Will not fit the Pro 3.
AVAILABLE EXCLUSIVELY AT BUY HPI!
35.00
72041 2 Aluminum Rear Hub 2 Degree
Replaces stock 2 degree uprights with stronger aluminum parts. Features an extra tuning hole for the outer camber link location. Will not fit the Pro 3.
AVAILABLE EXCLUSIVELY AT BUY HPI!
35.00
72045 1 Aluminum Lower Front Suspension Mount 2 Degrees (RS4 Pro 2) 
Available with 2 degrees of kick-up only. Use with #72021 on RS4 Pro 2 or use the included washers to add kick-up to upper suspension mounts. Will not fit Pro 3, RS4 MT, Nitro RS4 MT, Super Nitro RS4, Super Nitro Rally, RS4 Rally.
AVAILABLE EXCLUSIVELY AT BUY HPI!
28.00
72060 2 Aluminum Pulley Mount (Purple / Nitro RS4)
Strengthens the drivetrain of your Nitro car by replacing the front gear shaft plastic mounts. Combine with #A907, #72061 and #72068 for a super-strong drivetrain! All hardware necessary is included. Will not fit the Pro 3.
AVAILABLE EXCLUSIVELY AT BUY HPI!
28.00
72061 1 Aluminum Brake Block (Purple / Nitro RS4)  
Stronger and stiffer than the stock nylon brake block, this part also matches our other available purple anodized parts! Will not fit the Pro 3.See it installed on a car by clicking here.
AVAILABLE EXCLUSIVELY AT BUY HPI!
28.00
72062 6 Shock Spacers 0.3mm clear / 0.5mm smoke (6 pcs ea) 
Use this thin shock spacers to accurately set the ride of your car!
4.00
72063 6 Cone Washer 3.0mm/4-40 Aluminum (Purple / 6 pcs) Brighten up the look of your car with these great-looking cone washers! Although meant for use with flat head screws, you can use these as spacers under button head screws also. 5.00
72065 2 Aluminum Upright Set 
Take out any steering slop in your steering! Marked #1 and #2, make sure you install each arm on the correct side. Will not fit the Pro 3. See them installed on a car by clicking here.
AVAILABLE EXCLUSIVELY AT BUY HPI!
32.00
72068 1 Aluminum Gear Shaft Mount (Purple / Nitro RS4)
Stronger and stiffer than the stock nylon gear shaft mount, this part also matches our other available purple anodized parts! See it installed on a car by clicking here.
AVAILABLE EXCLUSIVELY AT BUY HPI!
28.00
72082 1 Universal Dogbone (Center Front / Nitro RS4 MT)  
More durable and efficient than stock center dogbone.

20.00

72083 1 Universal Dogbone (Center Rear / Nitro RS4 MT)  
More durable and efficient than stock center dogbone.

20.00

72085 1 Aluminum Upper Arm Mount Front (Super Nitro RS4) Stronger and stiffer than the stock nylon gear shaft mount, this part also matches our other available purple anodized parts!
AVAILABLE EXCLUSIVELY AT BUY HPI!
30.00
72088 1 Aluminum Upper Arm Mounts Rear (Super Nitro RS4) Stronger and stiffer than the stock nylon gear shaft mount, this part also matches our other available purple anodized parts!
AVAILABLE EXCLUSIVELY AT BUY HPI!
30.00
72094 1 Titanium Turnbuckle Set (Purple / RS4 MT / Nitro RS4 MT) Allows easy adjustment of camber and front toe settings with the included wrench. 39.00
72110 2 Silicone Exhaust Coupling (Purple / 2 pcs)
Two purple molded silicone exhaust couplings are included, plus four black nylon zip ties - use two zip ties per exhaust coupling to attach to header and tuned pipe.
5.00
72111 1 Shim Set 3 x 5mm
Includes ten each of 0.1mm, 0.2mm and 0.3mm shims for fixing slop on 3mm hinge pins and shafts.
6.00
72112 4 Bladder 10 x 4mm (FIRM)
These bladders are made of a stiffer type of silicon than the stock shock bladders, for quicker rebound after the shock is compressed. Used properly, these can increase traction on high-grip racing surfaces. One set of four.
4.00
72168 1 Heavy Duty Pulley 18 Tooth (Steel)
This 18 tooth pulley replaces one stock plastic belt pulley and is made from tough steel. Comes with replacement cross pins and e-clips, plus spares for your toolbox.
18.00
72170 2 Threaded Aluminum Shock Set (45-56mm)
The same shocks as featured on our Proceed 1/8 scale car. Uses threaded shock bodies, adjustment collars with o-rings, PTFE shock pistons, stainless steel shock shafts, clear silicone o-rings, shock bladders, blue linear springs and our #6818 plastic shock parts tree. Threaded shock bodies allow racers to make very fine adjustments to their car. We don't suggest using threaded shock bodies without a tweak board or setup gauges. Used for touring cars and Super Nitro RS4 cars only.
42.00
72171 1 Stainless Steel Hinge Pin Set with Rear Arm Brace (Nitro RS4 MT)
Significantly strengthens the suspension of the Nitro MT. Includes a thick aluminum brace that attaches to the back end of the rear differential, it will help keep the rear end intact in bad crashes.
16.00
72175 1 High Performance Air Cleaner
High flow, super duty air cleaner for HPI engines. Will not fit the Nitro Star Pro engines. Bent and straight neck with zip ties included.
16.00
72180 1 Aluminum Rear Brace Set (Nitro Rush)
Strengthens the rear end of the chassis for jumping and racing.
12.00
72190 1 Sway Bar Set (Nitro Rush)
Lets racers fine-tune the truck on flat surfaces.
18.00
72200 1 Stainless Steel Hinge Pin Set (Nitro Rush)
Strengthens the suspension joints of the Nitro Rush. Extra e-clips are included.
17.00
72208 1 Heavy-Duty Middle Gear (Nitro Rush)
Toughens the transmission for racing and hardcore bashing.
4.00
72213 2 Heavy Duty Differential Shafts (2 pcs / Gear Diff)
Designed to be stronger than the standard black differential shaft that are used in our gear differentials, these shafts are coated with a bright material for easy identification. These can be used in any of our kits that use gear differentials except the Nitro Rush- the Nitro Rush is equipped Heavy Duty Diff Shafts stock.
8.00
72215 1 Gear Diff Adjustment Spring Set (Medium, Firm, Stiff)
Use this set of springs to adjust and fine-tune the gear diff of your car. Can be used with #30005 HPI Pro Diff Gear Oil. Includes 2 medium, 1 firm, 1 stuff springs.
8.00
72222 1 Turnbuckle Set (Nitro 3)
A complete set of turnbuckles to adjust the camber and front toe-in of your Nitro RS4 3!
14.00
72225 1 Turnbuckle Set (Super Nitro Rally)
Steel turnbuckles prevent bending and include a full set of ball cups.
15.00
72228 1 Stainless Steel Suspension Shaft Set with Rear Brace (Nitro 3)
Improve the durability of your car with these extremely strong stainless steel hinge pins!
16.00
72230 1 Slipper Clutch Set (Nitro MT / Super Nitro Rally)
Provides extra protection to the drivetrain by allowing the gears to "give" or slip when landing off jumps. Adjustable from underneath the chassis.
33.00
72422 1 Aluminum Spring Perch (Purple/4 pcs)
Dress up your car with these lightweight replacement shock parts!

16.00

72515 1 Nitro Handling Kit (Rollcenter Plate)
Increase the traction and handling capabilities of your Nitro sedan or Super car. This set includes two sets of purple anodized 1.5mm thick aluminum plates, plus longer machine and self-tapping screws to install on any HPI Nitro sedan or Super car, whether you have the stock plastic or the new optional aluminum parts installed. Aluminum washers are included for racers who have the graphite upper deck installed. Set screws are included that allow racers to adjust tweak and suspension downtravel. Try running the car with one plate (1.5mm) installed first, then experiment with two plates (3mm total).
25.00
72516 1 2 Speed Transmission Heavy Duty (Nitro RS4)  
Uses the heavy duty first gear adapter and new first speed gears so high-powered Nitro engines will not damage the gear or one-way bearing. Perfect for our Nitro Star Pro engines! Gears and clutchbells are interchangeable for different ratios, and this will fit the Super Nitro for high-speed runs!See it installed on a car by clicking here.
80.00
73002 1 Front Shock Tower (Graphite / Super Nitro RS4)  
3mm/0.118 inch thick graphite is super strong to resist damage! Four shock mounting positions and two shock tower mounting positions provided.
20.00
73003 1 Rear Shock Tower (Graphite / Super Nitro RS4)  
3mm/0.118 inch thick graphite is super strong to resist damage! Three shock mounting positions and two shock tower mounting positions provided.
20.00
73004 1 Upper Deck (Graphite / Super Nitro RS4)  
Strong woven graphite upper deck stiffens the chassis, and still allows you to take out the radio tray easily. Purple aluminum joints included!
28.00
73017 1 Graphite Upper Deck (Nitro RS4 MT)  
Stiffens the chassis for more consistent suspension action. Includes aluminum hardware.

42.0

73020 1 Upper Deck Set (Graphite / Nitro Rush) 
Stiffens the chassis for more consistent suspension action. Includes purple aluminum hardware.

42.00

73030 1 Front Shock Tower (Graphite / Nitro Rush) 
Extra shock mounting positions make the Rush more tunable for racers. Full hardware set included.

24.00

73035 1 Rear Shock Tower (Graphite / Nitro Rush) 
Extra shock mounting positions make the Rush more tunable for racers. Full hardware set included.

24.00

73902 1 Heavy-Duty Main Chassis (Purple / Nitro RS4 MT)
Thicker for more durability and more consistent dampening.

42.00

73914 1 Super Chassis (RTR 3)
Cut from 7075 aircraft aluminum, this is the strongest and lightest chassis you can get for the RTR 3! 3mm thick and fully countersunk, even the front and rear ends are beveled to prevent any bottoming out.
85.00
74105 1 Glow Plug Igniter Set with AC Charger (120v) 
Rechargeable glow plug igniter with an overnight AC wall plug charger.

22.00

74108 1 Pro Glow Plug Igniter Set with AC Charger (120v)

Rechargeable glow plug igniter that features a charge meter with an overnight AC wall plug charger.

35.00

74111 1 4-Way Glow Plug Wrench (Small)

Remove glow plugs easily, and store up to 3 on the wrench itself. A must for any Nitro car owner!

6.00

74318 1 HPI Power Fuel 20% Nitro (1 quart)

A custom-formulated 14% synthetic/castor oil blend for extra life and reliability for your car's engine. HPI Power Fuel is made especially for HPI Racing by Wildcat Fuels.

10.00

74320 1 HPI Power Fuel 30% Nitro (1 quart)
See above for details.

12.00

74348 1 HPI Power Fuel 20% Nitro (1 gallon)
See above for details.

29.00

74350 1 HPI Power Fuel 30% Nitro (1 gallon)
See above for details.

35.00

75026
1
Front One-Way Differential 36 Tooth (Nitro R40)

42.00

75028 1 Cup Joint 6mm (Front One-Way Diff)
Spare part for #75026
8.00
75033
1
Rear Sway Bar Set (2.2mm Silver/2.6mm Gold)
for R40

5.00

76813 1 Spur Gear 43 Tooth (1M) (Adapter Type / Nitro 2 Speed)
Use only with #A882 Heavy Duty 1st Gear Adapter
4.00
76814 1 Spur Gear 44 Tooth (1M) (Adapter Type / Nitro 2 Speed)
Use only with #A882 Heavy Duty 1st Gear Adapter
4.00
76816 1 Spur Gear 46 Tooth (1M) (Adapter Type / Nitro 2 Speed)
Use only with #A882 Heavy Duty 1st Gear Adapter
4.00
76947 1 Spur Gear 47 Tooth (1M/1st Gear/2 Speed)

3.00

76948 1 Spur Gear 48 Tooth (1M/1st Gear/2 Speed)
R40 kit gear

3.00

76949 1 Spur Gear 49 Tooth (1M/1st Gear/2 Speed)

3.00

76953 1 Spur Gear 43 Tooth (1M/2nd Gear/2 Speed)

3.00

76954 1 Spur Gear 44 Tooth (1M/2nd Gear/2 Speed)

3.00

76955 1 Spur Gear 45 Tooth (1M/2nd Gear/2 Speed)
R40 kit gear

3.00

76956 1 Spur Gear 46 Tooth (1M/2nd Gear/2 Speed)

3.00

76960 1 Threaded Pinion Gear 15Tx12mm (1M/1st Gear/2 Speed)

4.00

76961 1 Threaded Pinion Gear 16Tx12mm (1M/1st Gear/2 Speed)
R40 kit gear

4.00

76962 1 Threaded Pinion Gear 17Tx12mm (1M/1st Gear/2 Speed)

4.00

76963 1 Threaded Pinion Gear 18Tx12mm (1M/1st Gear/2 Speed)

4.00

76968 1 Threaded Pinion Gear 18Tx16mm (1M/2nd Gear/2 Speed)

4.00

76969 1 Threaded Pinion Gear 19Tx16mm (1M/2nd Gear/2 Speed)
R40 kit gear

4.00

76970 1 Threaded Pinion Gear 20Tx16mm (1M/2nd Gear/2 Speed)

4.00

76971 1 Threaded Pinion Gear 21Tx16mm (1M/2nd Gear/2 Speed)

4.00

80814 1 MIP Shiny CVD's Front (2 pcs / RS4 MT / Nitro RS4 MT)
Amazingly strong steel CVD set that replaces the standard dogbones. Rebuildable and extremely efficient.
38.00
80815 1 MIP Shiny CVD's Rear (2 pcs / RS4 MT / Nitro RS4 MT / Nitro Rush)
Amazingly strong steel CVD set that replaces the standard dogbones. Rebuildable and extremely efficient.
38.00
80837
2
MIP CVDs (Front/Black/2 pcs)
For Nitro 3

32.00

80838 2 MIP CVDs (Rear/Black/2 pcs)
For Nitro 3
32.00
80839 1 MIP CVD Bone (Front/Black/1 pc)
Spare part for #80837
7.00
80840 1 MIP CVD Bone (Rear/Black/1 pc)
Spare part for #80838
7.00
86037 1 Aluminum Exhaust Header (Black/RTR 3/Nitro 3)
Features threaded clutchbell pinions and ball bearings for the pilot shaft. Allows your RTR 3 to get an additional 5-10 mph!
14.00
86038 1 2 Speed Transmission (RTR 3)
Features threaded clutchbell pinions and ball bearings for the pilot shaft. Allows your RTR 3 to get an additional 5-10 mph!
70.00
86162
1
Exhaust Header (Rear Exhaust Engine/U Shape/Short/Black)
Fits Nitro 3 with aftermarket aluminum pipe.

13.00

86163
1
Exhaust Header (Rear Exhaust Engine/U Shape/Long/Black)
Fits Nitro 3 with kit pipe.

13.00

86164
1
Exhaust Header (Rear Exhaust Engine/L Shape/Black)
Fits R40, Nitro and Nitro 2 kits, Nitro Rush

13.00

86274 1
Light Weight Drive Gear 32 Tooth (1M)

12.00

86275 1
Light Weight Idler Gear 29 Tooth (1M)

12.00

87021 1 Fuel Tank with Primer (75cc)
New style fuel tank, as used on the RTR Nitro RS4 3 car.
11.00
87120
1
HPI Roto Start System
The HPI Roto Start system replaces the standard pullstarter with a durable metal gear backplate and a handheld shaft driven starter. Starting is as simple as pressing a button. Requires a 7.2v rechargeable "stick" battery pack and charger. Complete instructions included. Some disassembly of the engine is required. This Roto Start System fits only HPI Nitro Star .12 and .15 engines. Standard stick-type 7.2v battery and charger required.
 
compatible with Kit Header
compatible with Aftermarket Header
Nitro 3
Yes
Yes
Nitro 2
Yes
No
Nitro
Yes
No
Nitro MT/Nitro MT Racer
Yes
Yes
Super Nitro Rally
Yes
Yes
Super Nitro
Yes
No
Nitro Rush
No
No
55.00
87121
1
Back Plate Unit (gears, case and screws) for additional engines
Extra Back Plate Unit allows you to use #87120 on multiple engines.
18.00
87173 1

Light Weight 2 Speed Transmission Set (0.8M)
This is a "must have" item for R40 owners who compete in race events, and is highly recommended by our team drivers.

70.00

86278 2 Heavy-Duty Diff. Shaft 14x34mm (Silver/2pcs)

16.00

A111 2 Super Shock Set 45-56 
For Touring Cars and Super Nitro RS4. Include PTFE shock pistons and red springs. Hard-anodized aluminum shock bodies and caps, stainless steel shock shafts. Shock bladders also included.

32.00

A169 3 Aluminum Pilot Shaft 
Use with ball bearings only. For steering arm on the Nitro RS4 and Nitro RS4 Racer.

5.00

A209 6 Sway Bar Set (Narrow RS4) 
Will fit all RS4 kits except wide original RS4

21.00

A214 1 Stainless Steel Hingepin Set (RS4 Mini)  
For a smoother suspension

17.00

A218 1 Rear Shock Mount (Woven Graphite)
Provides three holes for mounting shocks - nylon shock tower has only two. Includes mounting hardware.

18.00

A261 1 Stainless Steel Hinge Pin Set
Fits original Nitro RS4. Makes suspension action smoother, much stronger than kit hinge pins. Includes e-clips.

17.00

A301 8 Heavy-Duty Ball Cups 4.3 x 13mm (8 pcs)
Snap on securely and won't pop off in the worst wrecks. Feature the HPI logo on the top side.

4.00

A302 8 Heavy-Duty Ball Cups 4.3 x 18mm (8 pcs)
Snap on securely and won't pop off in the worst wrecks. Feature the HPI logo on the top side.

4.00

A303 8 Heavy-Duty Ball Cups 4.3 x 23mm (8 pcs)
Snap on securely and won't pop off in the worst wrecks. Feature the HPI logo on the top side.

4.00

A311 8 Rod End 4.8 x 10mm (8pcs)
Replace worn shock ends and tune the length of your shocks. Fits #A137 pivot ball, #A138 short ball end, #A167 long ball end, #A783 short purple ball end and #A139 ball end that attaches with 3mm machine screw.

4.00

A312 8 Rod End 4.8 x 12mm (8pcs)
See above for details.

4.00

A313 8 Rod End 4.8 x 14mm (8pcs)
See above for details.

4.00

A316 8 Rod End 5.8 x 12mm (8 pcs)
Use different lengths for camber links, captured steering links, and other projects. These larger rod ends fit our #A132 pivot ball perfectly.

4.00

A317 8 Rod End 5.8 x 15mm (8 pcs)
See above for details.

4.00

A318 8 Rod End 5.8 x 18mm (8 pcs)
See above for details.

4.00

A442 1 Spur Gear 37T 
for #A819 set, can use with all Nitro RS4 kits EXCEPT Super Nitro RS4. Use with #A826 clutchbell on large size tracks. Great for Nitro RS4 Mini.
4.00
A445 1 Spur Gear 39T 
for #A818 set, can use with all Nitro RS4 kits EXCEPT Super Nitro RS4. Use with #A825 clutchbell on medium size tracks.
4.00
A447 1 Spur Gear 41T 
stock second speed spur gear for #A910 Nitro RS4 2 Speed
4.00
A449 1 Spur Gear 44T
Stock first speed spur gear for #A910 Nitro RS4 2 Speed. If using #A882 HD 1st Gear Adapter, use #76814 44T spur gear.
4.00
A462 1 Carbon Graphite Upright Set
Stronger and stiffer, left and right 8 and 10 degree pieces included. Will not fit the Pro 3.

18.00

A463 1 Carbon Graphite Rear Bulkhead
Stronger and stiffer, left and right bulkhead pieces included. Will not fit the Pro 3.

18.00

A464 1 Carbon Graphite Front Bulkhead Set 
Stronger and stiffer, both upper and lower bulkhead pieces included. Will not fit the Pro 3.

12.00

A468 1 Carbon Graphite Suspension Arms (2 pairs/Super Nitro RS4)
Stiffer and stronger than stock suspension arms.

20.00

A469 1 Carbon Graphite Suspension Arms (2 pairs / Nitro RS4 RTR / 2 / Racer 2) 
Stiffer and stronger than stock suspension arms.

18.00

A502 1 Turnbuckle Set (For Narrow or Wide Nitro RS4)
Allows for easier camber and toe-in adjustments without taking ball cup off ball end. Prevents premature wear of the ball cup.

15.00

A510 2 RS4 Universal Dogbones (Front) (Narrow) Silver 
Increases efficiency, prevents losing dogbones. Fits 190mm wide original Nitro RS4.

34.00

A511 2 RS4 Universal Dogbones (Rear) (Narrow) Silver
Increases efficiency, prevents losing dogbones. Fits 190mm wide original Nitro RS4.

34.00

A513 2 RS4 Universal Dogbones (Front) (Wide) Black 
Increases efficiency, prevents losing dogbones. Fits original Nitro RS4/Racer.

34.00

A514 2 RS4 Universal Dogbones (Rear) (Wide) Black
Increases efficiency, prevents losing dogbones. Fits original Nitro RS4/Racer.

34.00

A516 2 RS4 Mini Universal Dogbones (Front) 
Increases efficiency, prevents losing dogbones

34.00

A517 2 RS4 Mini Universal Dogbones (Rear) 
Increases efficiency, prevents losing dogbones

34.00

A521 1 Universal Dogbones (Front) (Super Nitro RS4) 
Extra efficiency, and axle portion is made from extra-strong material for toughness!
34.00
A522 1 Universal Dogbones (Rear) (Super Nitro RS4) 
Extra efficiency, and axle portion is made from extra-strong material for toughness!
34.00
A570 1 Front Shock Tower Woven Graphite (All RS4 except Racer 2)  
Provides more shock mounting positions for tuning purposes, allows two different shock tower holes. Has two holes for mounting camber links, includes all mounting hardware.

10.00

A710 2 Aluminum Threaded Shock Set ( MT 2/ 2 pcs. ) 45.00
A712 8

Aluminum Threaded Shock Set (Savage)

135.00
A718 2 Aluminum Threaded Shock Set ( MT 2/ 2 pcs. ) 45.00
A730 1 Urethane Side Belt (All Nitro RS4)  
Use on prepared clean tracks only. Made the same way as our Proceed 1/8 scale car belts.
8.00
A732 1 Urethane Rear Belt (All Nitro RS4)  
Use on prepared clean tracks only. Made the same way as our Proceed 1/8 scale car belts.
8.00
A790 1 Joint 8 x 30mm (Purple / 4 pcs)  
Purple aluminum joints for use with the #A253 Graphite Belt Tensioner on the Pro 2, Pro/Sport/Rally/Mini kits and Nitro kit graphite upper decks
8.00
A791 1 14/17 Clutch Bell   8.00
A792 1 15/18 Clutch Bell   8.00
A801 1 Flywheel  
Machined aluminum flywheel. Use #A804 brass collet to mount onto engine.
8.50
A804 1 Collet 7 x 5mm  
Brass collet and washer for mounting #A801.
2.00
A811 1 11 Tooth Clutch Bell  
Lowers gearing more for more acceleration, for cars without 2 speed transmission. Will not fit the Nitro RS4 3 kits!
7.00
A812 1 12 Tooth Clutch Bell  
Lowers gearing for better acceleration, for cars without 2 speed transmission. Will not fit the Nitro RS4 3 kits!
7.00
A813 1 13 Tooth Clutch Bell  
Standard single speed clutch bell in all Nitro kits except Racer. Will not fit the Nitro RS4 3 kits!
7.00
A814 1 14T Clutch Bell 
Increases top end speed, for cars without 2 speed transmission. Will not fit the Nitro RS4 3 kits!

7.00

A815 1 15T Clutch Bell
Increases top end speed more, for cars without 2 speed transmission. Will not fit the Nitro RS4 3 kits!

7.00

A818 1 2 Speed Second Gear Set (39/18 Tooth)  
Makes second gear final drive 4.68 for higher top end speed. Note: Not recommended for Super Nitro RS4! Will not fit the Nitro RS4 3 kits!

13.00

A819 1 2 Speed Second Gear Set (37/20 Tooth)
Makes second gear final drive 3.99 for insane top end speed! PERFECT for Nitro RS4 Mini racers! Note: Not recommended for stock engines or Super Nitro RS4! Will not fit the Nitro RS4 3 kits!

13.00

A820 1 Clutchbell 11/14T 
use with #A882 HD 1st Gear Adapter and one of these spur gear combinations: 76813/76816 or 76814/A447. Recommended for Super Nitro RS4 only on small tracks. Will not fit the Nitro RS4 3 kits!

12.00

A821 1 Clutchbell 12/15T 
use with #A882 HD 1st Gear Adapter and one of these spur gear combinations: 76813/76816 or 76814/A447. Recommended for Super Nitro RS4 only on small to medium size tracks. Will not fit the Nitro RS4 3 kits!

12.00

A823 1 Clutchbell 13/16T 
for #A910, stock Nitro 2 Speed clutchbell. For Super Nitro RS4, combine with #A882 HD 1st Gear Adapter and one of these spur gear combinations: 76813/76816 (medium to large size tracks) or 76814/A447 (large tracks).
For ALL OTHER NITRO RS4: use with stock Nitro 2 Speed spur gears (44T and 41T) on small tracks. If using #A882 HD 1st Gear Adapter, use #76814 44T spur gear. Will not fit the Nitro RS4 3 kits!

10.00

A825 1 Clutchbell 13/18T 
for #A818 set, can use with all Nitro RS4 kits EXCEPT Super Nitro RS4. Use with 44T and 39T spur gears on medium size tracks. If using #A882 HD 1st Gear Adapter, use #76814 44T spur gear. Will not fit the Nitro RS4 3 kits!

10.00

A826 1 Clutchbell 13/20T 
for #A819 set, can use with all Nitro RS4 kits EXCEPT Super Nitro RS4. Use with 44T and 37T spur gears on large size tracks. If using #A882 HD 1st Gear Adapter, use #76814 44T spur gear. Great for Nitro RS4 Mini. Will not fit the Nitro RS4 3 kits!

10.00

A844 1 Fiber Brake Disc  
Thicker, more durable, resists melting from high speed, high demand racing. Set screw head to brake block distance at 20mm or 0.8".

14.00

A856 1 Heavy-Duty 38 Tooth Final Gear (P1x38T) (Nitro RS4 MT) Machined out of a harder metal than the stock final gear. More durable and longer-lasting. We recommend purchasing #A856 and #A857 in sets for each diff.)

35.00

A857 1 Heavy-Duty 13 Tooth Final Gear (P1x13T) (Nitro RS4 MT) Machined out of a harder metal than the stock final gear. More durable and longer-lasting. We recommend purchasing #A856 and #A857 in sets for each diff.

15.00

A869 1 Side Muffler and Manifold Set (RTR Nitro RS4) 
Plastic side muffler and aluminum manifold set. Can replace can-type muffler. Similar performance as older can-type muffler but looks cooler.

22.00

A882 1 Heavy Duty First Gear Adapter (Purple / Nitro 2 Speed)
Perfect for the Super Nitro RS4 and any Nitro RS4 car with a high-powered engine. Purple anodized aluminum hub for new first gear spur gears on Nitro 2 Speed. Includes one-way bearing pre-installed. Use with new first gear "adapter type" spur gears #76813, 76814 or 76816

19.00

A885 1 Nitro Racing Clutch
Three-way adjustable clutch shoes, fits any HPI flywheel. Loop style spring for smooth power transfer. Won't burn up under extreme conditions. Click here for a picture of the unassembled parts.

15.00

A888 1 2 Speed Maintenance Set
Includes 2 spare balls, 2 spare black springs, 2 spare silver springs and 2 spare set screws. Not for use with the Nitro RS4 3 kit!

5.00

A889 1 Slide Carb Linkage Set 
Fit the Nitro Star Pro 12R SC or Nitro Star 15SC engines in your car with this throttle linkage set. Includes all the parts necessary, some parts that are already on your car will be needed also. Note to NXT truck owners: Slide carb engines will not fit in the Losi NXT truck. Click here to see the individual parts.

8.00

A903 1 Nitro RS4 Super Chassis 7075S 
Lightweight 3mm thick countersunk and anodized aluminum, comes with flathead screws. 7000 series aluminum for high quality and extreme stiffness!

95.00

A905 1 39T Ball Diff Set (All Nitro RS4)  
Will allow you to tune your car for better cornering. Recommended for advanced racers only.

35.00

A907 1 Gear Brace Set For Nitro RS4 
Reduces slop in the gear shaft and pulley shaft for cars with high-power engines. Includes 4 ball bearings and belt tensioner.

34.00

A910 1 2 Speed Transmission For Nitro RS4  
Higher second gear allows for faster top speed. Adjustable shift point. Click here for an unassembled view of the parts. See part #'s A823, A447, A449 for stock clutchbell and spur gear replacement parts. #A882 Heavy Duty First Gear Adapter also now available, must use new 1st speed gears; see #76813, 76814, 76816. Many other option parts available, see elsewhere on this list for new gearing options. Will not fit the Nitro RS4 3 kits!

69.00

A911 1 2 Speed Transmission (Super Nitro RS4)
Lower overall gear ratio suited to the larger tires on Super Nitro RS4 cars. Uses our #A882 Heavy Duty First Gear Adapter so gears will not be damaged by high-powered engines. Gearing is 12/46 for first gear, 15/43 for second gear. Gearing can be changed with optional clutchbells and spur gears - not included. Click here to see a disassembled picture.

80.00

A912 1 2 Speed Transmission (Nitro MT / Super Nitro Rally)
Use for on-road use ONLY. Gearing is 11/52 for first gear, 14/49 for second. Use #A821 12/15 clutch bell for higher gearing.

90.00

A914 1 Heavy-Duty Main Chassis (Purple)  
2.5mm purple anodized countersunk chassis for Nitro RS4. Comes with all necessary screws for assembly.

34.00

A915 2 Heat Sink Engine Mount 20mm For Pull Start 
Anodized aluminum, finned to dissipate heat. Includes screws to mount to engine and chassis. Use with kit stock flywheel or #A925.

45.00

A920 2 Heat Sink Engine Mount 15mm For Non-Pull Start
Anodized aluminum, finned to dissipate heat. For non-pullstart engines only! Lowers the engine for better center of gravity. Includes screws to mount to engine and chassis. Must use with #A926, A940 and A950

45.00

A925 1 Lightweight Flywheel 40mm For Pull Start 
Lightens rotating weight for faster straightaway speeds and more RPM. Use with stock engine mounts or #A915. Requires #A804 Brass Collet and Washer set for installation on any kit with 15FE engine.

20.00

A926 1 Lightweight Flywheel 32mm For Non-Pull Start
Lightens rotating weight for faster straightaway speeds and more RPM. Must be used with #A920, A940 and A950 (or A970 set). Requires #A804 Brass Collet and Washer set for installation on any kit with 15FE engine.

18.00

A928 1 Oil Catch For Nitro Star Engines 
Fits around front engine bearing on crankshaft and keeps oil off chassis and brake disk. Has drain hole. Will not fit Nitro Star Pro 12R SC Engine. Fits HPI engines Nitro Star 12E, 15FE, 15SS and 15SC.

17.00

A933 1 Nitro RS4 Upper Deck Graphite Set 
Stiffens the chassis for more consistent suspension and less flex. Woven graphite deck with all hardware necessary for installation.

30.00

A934 1 Nitro RS4 Upper Deck Graphite Set for Nitro Racer 2 
Stiffens the chassis for more consistent suspension and less flex. Woven graphite deck with all hardware necessary for installation. Includes mounts for attaching the servo to the chassis.

32.00

A935 1 Nitro RS4 Rear Brace Graphite Set
Rear Y-brace stiffens the rear of the chassis for more consistent suspension and less flex. Woven graphite piece, use screws included with kit to replace stock nylon rear brace. Includes antenna mount.

10.00

A940 1 Tuned Pipe .12 to .15  
Aluminum body dual chamber tuned pipe. Provides more power overall. Louder than stock muffler. Will not fit the Nitro RS4 Mini.

65.00

A947 1 Tuned Pipe Retainer Wires
Two replacement wires for the #A940 Tuned Pipe. Perfect spare parts for Nitro RS4 racers!

4.00

A950 1 Exhaust Header (OS, HPI)  
Aluminum Fits perfectly with A940 Tuned Pipe and Nitro Star or O.S. engines. Specifically for the Nitro RS4. Will not fit the Nitro RS4 Mini.

32.00

A955 1 Nitro Mini RS4 Upper Deck Graphite Set 
Stiffens the chassis for more consistent suspension

32.00

A958 1 Ball Differential Set (Nitro RS4 MT)  
Allows infinite external adjustments to the differential settings. For front or rear use.

38.00

A959 1 Super Front One-Way Differential 39T  
Uses FOUR one-way bearings instead of two (as on #A506) for increased durability. Purple anodized! This is the only One-Way Diff we recommend for Nitro racers.
49.00
A960 1 Belt Tensioner (Nitro RS4, Nitro RS4 Mini)  
Tensioner for the front belt. Includes two bearings! For an unassembled view, click here.
9.00
A966 1 Super Nitro RS4 Super Chassis 7075S  
3mm thick, super-strong 7000 series aircraft aluminum. Fully countersunk screw heads, and a full set of flathead screws is included.
95.00
A970 1 Tuned Pipe and Exhaust Header Set  
Combines #A940 Tuned Pipe and #A950 Exhaust Header sets in one package.

89.00

A988 1 Heavy Duty Clutchbell 13 Tooth (1M) for Savage 12.00
A990 1 Heavy Duty Clutchbell 15 Tooth (1M) for Savage 12.00
A991 1 Heavy Duty Clutchbell 16 Tooth (1M) for Savage 12.00
B041 16 Ball Bearing Set For Nitro RS4/Nitro RS4 Mini

59.99

Z056 5 Titanium TP. Binder Head Screw (3 x 8mm) 
Cool natural finish. Feature 2mm hex head for easy removal.

6.00

Z057 5 Titanium TP. Binder Head Screw (3 x 10mm) 
See above for details.

6.00

Z058 5 Titanium TP. Binder Head Screw (3 x 12mm) 
See above for details.

6.00

Z059 5 Titanium TP. Binder Head Screw (3 x 15mm) 
See above for details.

6.00

Z060 5 Titanium TP. Binder Head Screw (3 x 18mm) 
See above for details.

6.00

Z066 5 Titanium TP. Flat Head Screw (3 x 8mm) 
See above for details.

6.00

Z068 5 Titanium TP. Flat Head Screw (3 x 12mm) 
See above for details.

6.00

Z069 5 Titanium TP. Flat Head Screw (3 x 15mm) 
See above for details.

6.00

Z070 5 Titanium TP. Flat Head Screw (3 x 18mm) 
See above for details.

6.00

Z076 5 Aluminum TP. Flat Head Screw M3x8mm (Hex Socket / Purple / 5 pcs)
Purple anodized aluminum flat head self-tapping screws for any R/C car. Use a 2mm hex socket wrench.

4.00

Z078 5 Aluminum TP. Flat Head Screw M3x12mm (Hex Socket / Purple / 5 pcs)
See above for details.

4.00

Z079 5 Aluminum TP. Flat Head Screw M3x15mm (Hex Socket / Purple / 5 pcs)
See above for details.

4.00

Z162 1 Heavyweight Grease (Gear Diff)

4.00

Z675 1 Aluminum Thin Lock Nuts (Purple / 5 pcs)
Purple aluminum lock nuts for securing 3mm screws.

5.00

Z678 5 Aluminum Thin Lock Nuts (Purple / 5 pcs)

4.00

Z679 5 Aluminum Wheel Nut M4 (Purple / 5 pcs)

4.00