Why does the motorcycle lack power and fail to accelerate when throttling?
1 Answers
The reasons why a motorcycle lacks power and fails to accelerate when throttling are as follows: 1. Insufficient fuel: A lean air-fuel mixture causes insufficient piston thrust after ignition, prolongs combustion time, and leads to engine overheating. The symptom of a lean mixture is poor acceleration during operation; acceleration improves when manually adjusting the choke or pumping fuel, but power loss returns when not enriching the mixture, indicating the motorcycle is running lean. 2. Excessive fuel: A rich air-fuel mixture causes poor acceleration at low speeds. A rich mixture lacks sufficient oxygen during combustion, leading to incomplete combustion, reduced power, decreased fuel efficiency, and excessive carbon buildup that clogs the exhaust system, worsening the power loss. 3. Clogged air filter, excessively high carburetor float level: Fuel overflow in the carburetor float chamber; loose main jet in the carburetor; malfunctioning enrichment system in the carburetor; clogged main air jet in the carburetor. 4. Poor fuel quality or incorrect gasoline octane rating: Can cause knocking; expired gasoline may decompose and lose calorific value; water in the fuel leads to intermittent engine operation and backfiring; presence of other impurities in gasoline.
