Why does a motorcycle accelerate normally when cold but not when hot?
1 Answers
It is relatively normal for a cold-start motorcycle to have difficulty accelerating, and as long as it operates normally after warming up, there should be no major issues. In lower temperatures, a longer warm-up time may also be required. Analysis method for cold-start issues: If cold starting is somewhat difficult and acceleration at low speeds is slightly poor even after warming up, you can check whether the air filter and carburetor are clogged, whether the spark plug is faulty, recheck and adjust the carburetor's air-fuel mixture ratio, and inspect whether the valve clearance is too small. Idle speed specifications for motorcycles: The idle speed of a motorcycle is set based on the standard of a warmed-up engine. When the engine is cold, the idle speed may be lower or even stall, which is a relatively normal phenomenon. First, check whether the idle speed is too low. The idle speed should reach around 1500 RPM when the engine is warm. If the idle speed is too low, it may affect cold starts and increase the likelihood of stalling, potentially causing increased engine vibration and noise, as well as reduced oil pump supply affecting lubrication. During cold starts, appropriately use the choke and throttle to maintain low RPM for warm-up. If the idle speed stabilizes after warming up, there is no issue. Additionally, you can also check whether the carburetor's mixture is too lean, whether the valve clearance is too small, or whether the spark plug is faulty.
