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49cc Engine with Gear Reduction Transmission for 20T T8F Sprocket Pocket Bike Gas Scooter Mini ATV The engine is with air-forced cooling system so it's doesn't matter which direction the engine end goes to. Air filter goes in front or rear are both OK. Just please pay attention to the rotation of engine and output sprocket.The sprocket rotates in opposite direction with engine. When you face the clutch pad and sprocket side, the engine rotates anti-clockwise, but the output sprocket rotates clock-wise.Specifications: 49cc single cylinder, air-cooled, 2-stroke Fuel: 25:1 gasoline / engine oil mixPiston Diameter:44mm Displacement:49cc Gear Box Reduction Rate: 3.55 : 1 Start Way: pull start Cooling: Air forced cooling Sprocket Size: 20 teeth fit T8F chain Spark Plug Size: L7T L7TC Top Mounting Brackets: 11cm Bottom Mounting Brackets: 10.3cm Top Through Hole Diameter M.B.: 0.161" Bottom Through Hole Diameter M.B.: 0.245" Exhaust Diameter: 0.589" Connector: 2 Pin Length: 26cm Width: 31cm Height: 20cm Clutch Mounting Hole Distance: 7.3cm Clutch Mounting Hole Diameter: 0.289" Clutch Pad: 2 Shoe Carburetor Hole Diameter: 0.213" Pull Start Mounting Hole Distance: 7.3cm Weight: 4.5KGFit: Majority of gas scooters, pocket bikes, and mini choppers Mini Quad Kid ATV Complete 49CC 2 Stroke Engine for Pocket Bike, Mini Dirt Bike, ATV or Scooter Please make sure it is fit on your bike before purchased.