| 摘要 |
In a scooter engine having valve lifters ( 33 ) interposed between intake valves ( 16 ) and a cam shaft ( 31 ), as well as between exhaust valves ( 17 ) and a cam shaft ( 32 ), with its axial line (C) of a cylinder ( 7 ) extending toward the front part of the vehicle body, a stopper ( 42 ) is provided in the cylinder ( 7 ) in the opposite position to a top face ( 33 a) of the valve lifters ( 33 ). The top face ( 33 a) of the valve lifters ( 33 ) is abutted against the stopper ( 42 ) when the valve lifters ( 33 ) move to fall off a cylinder head ( 12 ) as the cam shaft is removed from the cylinder head ( 12 ), thus the valve lifters ( 33 ) are prevented from falling off the cylinder ( 7 ) by the stopper ( 42 ). In this way, the valve lifters ( 33 ) are be kept assembled to the cylinder ( 7 ) even when the cam shaft is removed during the maintenance work. In other words, the DOHC engine ( 2 ) can be installed on a scooter while preventing the valve lifters ( 33 ) from falling off in the course of maintenance work.
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