Ofna .21 Hyper engine has oversized flow-through gray anodized cylinder head. ABC construction (Aluminum piston with a Chromed Brass cylinder). Rear exhaust. Ball bearing-supported crankshaft. Slide valve carburetor for greater response at the beginning and end of the power band. This works well for on-road and racing applications for fast take-offs and high speed. Needle valve adjusted by a screwdriver. SG (Pilot) shaft. This package includes one .21 Ofna Hyper racing engine w/slide valve carburetor and rear exhaust. One brass collet (these hold flywheel in place). One running and parts information sheets and one Hyper .21 decal sheet.

Fuel with 5%-30% Nitromethane (20% is recommended) and a lubricant content of 16% or more. Muffler or tuned pipe w/manifold. Glow plug: long without idle bar, can use O.S. Max #8.