This is a FT-160 Twin-Cylinder 4-Stroke Engine from O.S. Max. This Engine is a Flat (Opposed) Twin-Cylinder Engine, called the "Gemini-160". It is Scale-Like in Appearance when Installed in a Piper Cub or Citabria. FEATURES: 3-Crankshaft ball bearings 2-Camshaft ball bearings Twin opposed cylinders Ringed piston Geared camshaft (geared timing) New Two needle carb (OSMG2538) Two-year warranty INCLUDES: One Assembled FT-160 Twin Engine One Motor Mount (OSMG2804) with mounting hardware One Instruction Manual w/Decals and Poster One Dual Glow Plug Extension Cable One Locking Prop Nut Assembly Two #F Glow Plugs (installed) One gauge tools set One choke valve extension (rod) SPECS: Construction: Aluminum and Aluminum alloys Displacement: 13.26cc (x2) or .809 cu in (x2) Bore: 27.7mm (1.09") Stroke: 22.0mm (.866") Power Output: 2.0 BHP at 10,000 RPM Weight: 1100g (38.8oz) Practical RPM Range: 2,000 - 10,000 RPM Length: 120mm (4.72") from backplate to front of the drive washer Width: 196mm (7.72") Height: 80mm (3.15") Crankshaft Thread Size: 5/16-24 Suggested Props: 15x8, 16x6, 18x6, 18x7, 18x8, 20x6 Needle Settings: High Speed: 3.5 turns out from fully closed Mixture Control (low speed): Flush with carb body, then 2 turns in REQUIRES: Glow fuel with at least 16% lubricant content COMMENTS: No longer includes needle valve extension, knob and hook, M3x32 propeller slippage screws, motor mount template, or spare Woodruff key. 7/27/93 ir/jl updt lmm 4/6/09