This is the Force 28 Truggy Engine with Pull Starter from Ofna. FEATURES: ABC cylinder liner construction "A"luminum piston with a "B"rass cylinder liner that is "C"hrome plated Slide valve carburetor SG "pilot" type crankshaft Rear exhaust INCLUDES: Force 28 Truggy Engine with Pull Starter, tapered drive washer, silicone exhaust basket, instructions and parts list REQUIRES: Fuel: Car blend with 20% nitro Glow Plug: Medium heat range without idle bar Misc. field equipment, air filter, plug wrench and more SPECS: Displacement: .28 cu in (4.58 cc) Bore: 18.68mm Stroke: 16mm Output: 2.9 PS @ 32,000RPM Practical RPM Range: 2,500 - 32,000 Weight: 16.7oz (475g) Distance between mounting hole centers/same side: 0.83" (21mm) Distance between mounting hole centers/opposite side: 1.4" (37mm) Height/bottom of mounting tab to top of cylinder head: 4" (102mm) Height/bottom of crankcase to top of cylinder head: 4.5" (115mm) Width at mounting tabs: 1.8" (45.8mm) Length from pull starter to front bearing: 3.3" (84.2mm) Length from pull starter to end of crankshaft: 4.5" (114mm) Carb needle settings; Main Needle Valve: 3-3-1/2 turns form closed Low Speed Needle: Located in the center side of carb, set flush with ball end Barrel Stop Screw: Set for 1/16" inch gap COMMENTS: Some notes on rotary and slide valve carburetors; Rotary carbs offer a larger response in the middle of the power band. This works well for off-road applications when throttle response must be varied. Slide Valve carbs provide 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. jxs 3/13/08 ir/jxs