This is the HPI Nitro Star G3.0 Engine with Pull Starter used in the HPI Fire Storm FEATURES: Composite body rotary valve carburetor with 5.5mm bore Silver colored cooling head SG (pilot) type crankshaft Two year limited warranty INCLUDES: HPI Nitro Star G3.0 Engine with Pull Start, instruction manual, R5 cold glow plug (HPIG1504), foam air cleaner assembly with four zip ties, brass collet REQUIRES: Fuel: Car blend with 20-25% nitro content Misc Items: Fuel tubing and track equipment SPECS: Specs such as horsepower, bore, stroke and RPM were not provided- contact HPI for further infomation High Speed Needle Setting: Turn clockwise in 1/8 turn increments to lean fuel mixture. Do not exceed 2-1/2 turns from flush Idle Adjustment: Adjust for about 0.04" (1mm) gap between slide valve and carb body at bore opening Low Speed Needle: No adjustment recommended Displacement: .18 cu in (3.0cc) Distance Between Mounting Holes Same Side: 0.43" (11mm) Distance Between Mounting Holes Opposite Side: 1.22" (31mm) Height/Bottom Mounting Flanges to Top of Cylinder Head: 2.99" (76mm) Height/Bottom of Crankcase to Top of Cylinder Head: 3.5" (89mm) Length from Pull Starter to End of Crankshaft: 4.13" (105mm) Length from Pull Starter to Front Bearing: 3.3" (75.3mm) Length from Center of Crankcase to End of Crankshaft: 2.96" (75mm) Diameter of Carburetor Bore: 0.21" (5.5mm) kpm02/20/2007 ir/jxs