This is the HPI Nitro Star T3.0 Engine for use with the RTR Nitro RS4 3 Evo+ 1-piece black crankcase 6.5mm Rotary Carb Non-ringed/ ABC-type engine Standard crankshaft Side exhaust Heatsink Head One assembled engine with glow plug One instruction manual and sticker sheet One air filter with instruction sheet Three zip ties One hex wrench Height from crankcase bottom to top of cylinder head: 3.8" (96mm) Width including mounting tabs: 1.57" (40mm) Width below mounting tabs: 1.2" (31mm) Width between mounting holes same side: 0.43" (11mm) Width between mounting holes opposite side: 1.2" (31mm) Width of exhaust opening: 0.87" (22mm) Height of exhaust opening: 0.17" (4.2mm) Distance between muffler mounting holes 1.1" (28mm) Crankshaft Thread Size: 1/4-28 Bore x Stroke: 16.8 x 13.6mm Displacement: 0.18 cu in (3.01cc) Maximum Power: 2.2PS/31,000 RPM REQUIRES Fuel with 20%-25% Nitromethane and 18% (minimum) oil content The factory setting of the needle valves are as follows: High speed needle: Flush with the carburetor body Low Speed Needle: Flush with the carburetor body cnh 5/28/08 ir/jxs &