Ofna .21 Force 4- Port engine has oversized flow-through blue 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 includes 1) .21 Ofna Force engine w/slide valve carburetor. 1) Flywheel (8.3mm ID x 24.6mm OD x 7.4mm Thick). 2) Brass collets (these hold flywheel in place). 1) Black silicone O-ring (15mm ID x 19mm OD x 11mm Thick). 1) Running and parts information sheets.

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