Nitro Star S-25

shown with optional Roto Start Backplate and Savage engine mount

Nitro Star S-25 instruction manual

Click here for important S-25 engine update information!

ENGINE EXPLODED VIEW CORRECTION
In the S-25 engine manual that comes with the Savage 25, the part numbers listed in the rear of the manual (see the far left panel below) are incorrect. Click the picture below to see the correct part numbers. The full exploded view on the fold-out page (see the far right panel below) has the correct numbers already.

Now available from HPI Racing is our Nitro Star S-25 engine!This powerful new engine has 20% more displacement than our Nitro Star 21BB engine!

The Nitro Star S-25 is a .25 cubic inch (4.1cc) big block engine that features a machined billet aluminum heatsink head for extra cooling, dual bushing aluminum connecting rod, true ABC chrome sleeve construction for durability, and a simplified dual needle 7mm slide carburetor for easier tuning with a composite body for better performance at higher temperatures.

Nitro Star S-25 instruction manual

HPI Nitro Star engines have a 2 year limited warranty. Read our Nitro Star Engine Warranty.