This is the 2-stroke O.S. Max 28XZ Truggy Engine. / / ****** Because of the expressed racing nature of this engine, ****** / ****** it is NOT covered by the O.S. 2 Year Warranty ****** / ****** per page 8 of manual ****** / / FEATURES: Designed for 1/8 scale truggy applications / Aluminum crankcase, black in color / Three needle 21J slide valve carburetor / 8mm red carb insert for smaller tracks that restrict air intake and / 9mm blue carb insert for higher RPM applications and larger tracks / Six port piston sleeve ensures high power / Ten fin blue anodized cooling head with inner head button / / INCLUDES: O.S. Max 28XZ Truggy Engine with instruction manual, P3 turbo glow / plug, 8mm & 9mm carb inserts, extra copper head shim, exhaust / gasket, dust cap set and instruction manual / / REQUIRES: Fuel: 10-30% nitro content (20% for break-in) / Air Filter: MSFG1660 / Exhaust system depending on vehicle, see