This is the Thunder Tiger F-130S Four Stroke Model Airplane Engine. FEATURES: CNC machined components Black coated aluminum muffler Reversible updraft carburetor with mixture and idle valves located on same side for increased safety XC2 hyper nano technology composite cylinder coating Knife-edge design connecting rod Dual ball bearing-supported crankshaft Three year limited warranty through Hobby Services beginning at date of purchase INCLUDES: Thunder Tiger F-130S Four Stroke Engine with carburetor, 1.5, 2.0 2.5 and 3mm hex wrenches, muffler, decals, instruction manual 5 & 5.5mm box wrench, RF glow plug, 1.4" (37mm) exhaust pipe and two valve adjusting shims REQUIRES: Fuel: At least 20% lubricant with 10-15% nitro content, fuels containing a blend of both castor and synthetic oils are best Propeller: 14x10 for break-in Glow starter, plug wrench and field equipment SPECS: Displacement: 1.298 cu in (21.28cc) Bore: 1.323" (33.6mm) Stroke: 0.945" (24mm) Practical RPM: 2,000 - 12,000 Output BHP/RPM: 2.2 HP - 11,000 Weight: 29.01oz (822.5g) Carburetor Settings-NOTE carburetor is preset from the factory and requires only small adjustments Needle Valve: 2-3/4 - 3 turns counterclockwise from closed Mixture Metering Screw: After setting needle valve, 1/8 turn clockwise if mixture is too rich or 1/8 turn counter-clockwise if mixture is too lean Height from Mounting Tab Bottom/Top of Cylinder Head: 3.9" (99.3mm) Height from Crankcase Bottom to Top of Cylinder Head: 4.8" (122mm) Width at Mounting Tabs: 2.6" (67mm) Width of Crankcase below Mounting Tabs: 1.8" (46mm) Center of Mounting Holes Same Side: 0.98" (25mm) Center of Mounting Holes Opposite Side: 2.3" (58mm) Center of Crankcase to Front Bearing: 2.7" (68mm) Distance from Backplate to Front Bearing: 3.8" (96mm) Crankshaft Size: 5/16-24 jxs 10/27/10 ir/jxs