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Why can't a motorcycle start after being left unused for a long time?

1 Answers

MacRuth

07/28/25 11:25pm

Motorcycle failure to start after prolonged storage can be attributed to the following reasons: 1. Gasoline that remains unused for over 6 months will develop gum deposits. Once gasoline forms gum deposits, it becomes unusable and must be discarded; 2. Extended storage causes loss of lubrication and sealing in various engine components, resulting in low cylinder pressure and insufficient lubrication of parts like the crankshaft. This makes the motorcycle difficult to start quickly, requiring manual rapid rotation of the crankshaft to restore oil flow and lubrication in the oil passages; 3. A battery left unused for 6 months will typically lose its charge, rendering it unable to start the motorcycle; 4. Electrical components such as spark plugs and ignition coils may become damp and develop electrical leakage.

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