Super upgraded YD100 100CC motorized bike engine kit. Fits most 26″ bikes. Upgrades include: Red Speed carburetor and upgraded CDI. The engine is mounted to the bike frame with 4 bolts and this kit has an 8mm diameter compared to the standard 6mm. This means the mounts are twice as strong and reliable. Kit includes: A. 1 x 100cc cylinder. B. High Strength Hex Bolts C. Connecting Rod D. Silver Thick Connecting Rod E. High Quality Kit F. Red Carburetor G. 44 Tooth Chrome Sprocket H. 40mm Intake Pipe I. Long Chrome Muffler J. 202 Bearing Inside Engine K. Large Front Mount L. Chrome Chain Tensioner with Bearing M. High Quality Clutch Lever The engine requires 8 ounces of 2-stroke oil per gallon of gasoline during the break-in period. Super upgraded YD100 100cc motorized bicycle engine kit. Fits most 26″ bikes. Upgrades include: Red Speed Carburetor and upgraded CDI. 4 bolts secure the engine to your bike’s frame and this kit comes with 8mm bolts compared to the standard 6mm. This means the mounts are twice as strong and twice as reliable. Kit includes: A. 1 x 100cc Cylinder B. High Strength Hex Bolts C. Connecting Rod D. Silver Thick Connecting Rod E. High Quality Kit F. Red Carburetor G. 44T Chrome Sprocket H. 40MM Intake I. Long Angle Chrome Muffler J. 202 Bearing Inside Engine K. Large Front Mount L. Chrome Chain Tensioner with Bearing M. High Quality Clutch Lever The engine requires 8 ounces of 2-stroke oil per gallon of gas during the break-in period. Super Upgraded YD100 100CC Motorized Bicycle Engine Kit. Fits most 26″ motorcycles. Upgrades include: Red Speed Carburetor and Upgraded CDI. The engine is attached to the bike frame with 4 bolts and this kit has an 8mm diameter compared to the standard 6mm. This means the mounts are twice as strong and twice as reliable. The kit includes: A. 1 x 100cc cylinder B. High strength hex bolts C. Connecting rod D. Silver thick connecting rod E. High quality kit F. Red carburetor G. 44 tooth chrome sprocket H. 40mm intake pipe I. Long chrome muffler J. 202 bearing inside the engine K. Large front mount L. Chrome chain tensioner with bearing M. High quality clutch lever The engine requires 8 ounces of 2-stroke oil per gallon of gas during the break-in period.