O.S. Ducted Fan Engines have rear exhaust. Schnuerle Porting. 2-piece crankcase. 2-crankshaft ball bearings. Rear-mounted carburetor. Drum rotor induction. ABC piston/cylinder (aluminum piston with a chromed brass cylinder). This product includes one assembled .91 VR-DF engine w/small head. One set of instructions and poster. One exhaust adaptor w/screws and O-ring. Bellcrank for use with the remote needle assembly (comes with the engine!)

Glow Plug (O.S. #8 or #9. Tuned pipe (we don't carry, contact the manufacturer of the kit).
Fuel with 20% MINIMUM lubricant content and 20%-50% Nitromethane
Wildcat Ducted Fan fuel exceeds these requirements