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故障现象:一辆JH50型摩托车,启动容易,怠速正常,无高速(30公里每小时)。 故障分析与排除:启动后反复调整化油器混合气螺钉,发动机无明显改善。取下火花塞观察,电极颜色正常。做跳火试验,火花正常。拆下化油器,清洗主量孔和雾化管。复装后试车,故障仍然存在。准备对点火电路进行对比实验时,偶然听到车主谈起该车已有几千公里未曾进行保养。遂推断可能是由于发动机积炭严重,造成排气不畅引起故障。拆卸缸头、缸体、消声器观察,其中缸体排气孔积炭面积已达3/5之多。清洗各零部件,疏通消声器。装车后启动,路试车速可达50公里每小时。故障排除。
Symptoms: a JH50 motorcycle, easy to start, normal idle speed, no high-speed (30 km per hour). Failure Analysis and Troubleshooting: After starting to repeatedly adjust the carburetor mixture screw, the engine without significant improvement. Remove the spark plug observation, the electrode color is normal. Do jump test, spark normal. Remove the carburetor, wash the main hole and spray tube. After the installation test, the fault still exists. In preparation for a comparative test of the ignition circuit, it was accidental to hear the owner talk about how many thousand kilometers the car had not been serviced. Then infer that may be due to serious engine coke, resulting in poor exhaust caused by failure. Demolition of the cylinder head, cylinder, muffler observation, in which the cylinder exhaust vent coke area has reached as much as 3/5. Clean the parts, clear the muffler. After loading start, road test speed up to 50 km per hour. Troubleshooting.