SERVICE MANUAL 150cc Engine - 49ccScoot.Com

1 SERVICE MANUAL . 150cc Engine TABLE OF CONTENTS. CHASSIS NUTS AND BOLTS 1. Engine 3. LUBRICATION SYSTEM 18. FUEL SUPPLY SYSTEM 22. TRANSMISSION COMPONENTS 27. ELECTRICAL STARTING SYSTEM 30. BELT DRIVE CVT MECHANISM 36. CLUTCH 40. REAR TRANSMISSION SYSTEM 45. ELECTRICAL SYSTEM 50. IGNITION SYSTEM 56. CHASSIS NUTS AND BOLTS. Note: ,QVSHFW WKH UVW ZHHN DQG WKHQ HYHU\ PRQWK WKHUHDIWHU. Always pay attention to the unit s nuts and bolts. Some loosening after use is normal. Check to ensure that all nuts and bolts are tight. Torque Tightening Chart Bolt Conventional Marked Bolt Marked Bolt Diameter Ib-ft Ib-ft 4 1~2 ~ ~ ~ 3 ~ ~ 5 1~4 ~ ~ 3~6 ~ ~ 6 4~7 ~ ~ 8 ~ 12 ~ ~ 8 10 ~ 16 ~ ~ 18 ~ 28 ~ ~ 10 22 ~ 35 ~ ~ 40 ~ 60 ~ ~ 12 35 ~ 50 ~ ~ 40 70 ~ 100 ~ ~ 14 50 ~ 80 ~ ~ 58 110 ~ 160 ~ ~ 16 80 ~ 130 ~ 58 ~ 94 170 ~ 250 ~ 25.

2 ~ 18 130 ~ 190 ~ 94 ~ 200 ~ 280 20 ~ ~ FUEL SWITCH (PETCOCK). Periodically clean the petcock externally with grease remover and water. Check for any leaks or seeping fuel. Replace the petcock if there are any leaks found. This vehicle has a manually operated fuel valve. There are three positions. ON position The normal operating position for the fuel valve lever is the ON position. In this position, fuel will RZ WR WKH FDUEXUHWRr. RES position If the fuel level in the fuel tank becomes too low for the Engine to operate with the fuel valve lever in the ON position, turn the lever to the RES position to use the reserve fuel supply, and refuel as soon as possible. OFF position The closing position for the fuel valve is the OFF position. When the vehicle is not in use, always make sure the petcock is in the OFF position.

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5 CYLINDER REMOVAL. The removal can be done on the vehicle body. Remove cylinder head. Remove cylinder. Remove cylinder gasket, bolts Clean cylinder gasket and remove any debris. Caution! Do not damage the cylinder area. Make sure not to drop anything, including cylinder gasket material, into the crankcase. CYLINDER INNER WALL WEAR INSPECTION. Use a bore diameter dial gauge to measure the degree of wear. The measure point is divided into three sectional planes in the axial direction: upper, middle and lower; measure every plane each time on the mutually perpendicular directions (X, Y), the mea- sured least dimension is the cylinder bore; at the most upper position measured is the largest diameter, and the lowest position measured is the smallest diameter, their difference is the cylin- dricity of the cylinder.

6 At the same cross section, measure the difference of diameter between two points mutually perpendicular; which is the circularity of the cylinder. In order to make the measuring point perpendicular with the bore axis of the cyl- inder, and to ensure the precision of the measurement, the bar of the gauge can be slightly swung in the direction of the gauge bar, and take the smallest reading number as the result. In the situation without a dial gauge, a feeler gauge can be used to make relativity measurement. put a new piston into the cylinder, and use the feeler gauge to measure the gap between the piston skirt and the cylinder wall. T hen gure out the abrasion loss of the cylinder. If the circu- larity of the cylinder exceeds the limit, then a cylinder reboring machine should be used to rebore the cylinder, and enlarge its diameter by or , then t the piston and piston ring which size are also enlarged.

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