What are the reasons for insufficient fuel supply in motorcycles?

[DelValerie]

The reasons for insufficient fuel supply in motorcycles are as follows: 1. Insufficient piston thrust: A lean air-fuel mixture causes insufficient gas thrust on the piston after ignition, leading to prolonged combustion time and engine overheating. The symptoms of a lean mixture include poor acceleration during operation. When manually adjusting the choke or pumping fuel, acceleration improves, but without enriching the mixture, acceleration weakness reappears, indicating the motorcycle is in a lean fuel state. 2. Poor crankshaft case sealing in two-stroke engines: Air leakage due to failed crankshaft oil seal on the generator side; air leakage at the crankshaft case midline joint; air leakage at the joint between the crankshaft case and cylinder, or incorrect piston installation direction.