把减压阀放在非减压位置,然后转动飞轮进行试验。当转到压缩行程位置时,把耳朵贴近进排气管,这时会听到是进气门漏气还是排气门漏气,或是同时漏气。待确定是哪个气门漏气后,就应对气门进行修复。修复的方法是:将缸盖卸下,送到修理部去铣削气门座,再更换新的气门,用研磨砂仔细地研磨。研磨 Place the pressure reducing valve in a non-depressurized position and rotate the flywheel for testing. When it comes to the compression stroke position, put your ear close to the exhaust pipe, then you will hear is the intake valve leak or exhaust valve leak, or at the same time leak. To be sure which valve leaks, the valve should be repaired. Repair method is: remove the cylinder head, sent to the repair department to milling valve seat, and then replace the new valve, carefully grind with abrasive sand. Grind