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Why is it difficult to start a motorcycle when it's cold?

1 Answers

LeTyler

07/29/25 4:49pm

Reasons for difficulty in starting a cold motorcycle include low cylinder compression, carburetor malfunctions, and incorrect engine oil grade. Specific explanations are as follows: Low cylinder compression: The main causes of low cylinder compression in motorcycles are poor valve sealing, worn piston rings, and cylinder wear. First, check the valve clearance. If any valve clearance is too small, adjust it to the normal position. Carburetor malfunction: Low fuel level in the carburetor and excessively lean air-fuel mixture can both cause difficulty in starting a cold motorcycle. Adjust the carburetor float plate and air-fuel mixture to increase the fuel level and mixture concentration, thereby solving the cold-start issue. Incorrect engine oil grade: Some riders overlook the engine oil grade for their motorcycles and continue using summer-grade oil in cold weather. In winter, the low-temperature fluidity of the oil is poor, increasing the resistance of internal engine components and making cold starts difficult.

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