Why does a scooter motorcycle experience weak acceleration and sputtering?

[GraceFitz]

The reasons for weak acceleration in a scooter motorcycle are: Fuel system malfunction: An excessively lean air-fuel mixture results in insufficient gas pressure on the piston after ignition; an overly rich mixture causes weak acceleration at low speeds; a clogged air filter or an excessively high carburetor float level. Decreased engine compression ratio: Engine power is directly related to the compression ratio. With prolonged use, internal engine components wear out. If key components become excessively worn, the engine's compression ratio will decrease. Transmission system malfunction: Clutch slippage can severely reduce the vehicle's acceleration performance. To troubleshoot this issue, start with external inspections. First, check the engine's combustion condition, then adjust the carburetor accordingly based on the combustion performance. If the improvement is not significant, inspect the ignition system according to the symptoms. If the problem persists after these steps, disassemble the engine for further inspection.