Ofna oversized flow-through red anodized cylinder head. ABC construction (Aluminum piston with a chromed brass cylinder). Rear exhaust. Ball bearing supported crankshaft. Slide valve rotatable carburetor. Needle valve adjusted by a screwdriver. This package one .21 Ofna Force engine w/slide valve carb. (NO PULL START). Two Brass collets (these hold flywheel in place). One black silicone O-ring (15mm ID x 19mm OD x 11mm Thick). One running and parts information sheets. The difference between this engine and the regular force .21's is that it has more ports, produces more power and has a different head.

Fuel with 5%-30% Nitromethane (15% is recommended) and a lubricant content of 18% or more. Muffler (or tuned pipe with header). Glow plug.