What Causes a Motorcycle to Stall When Throttle is Released?

[TylerDella]

Motorcycle stalling when the throttle is released can be attributed to the following reasons: Incorrect Fuel Mixture Ratio: Low idle speed is common during cold starts. If the issue persists after the engine warms up, check if the idle speed is set too low or if the fuel mixture ratio is incorrect. Engine Air Leak: Air leaks usually occur due to poor sealing between the carburetor and the engine. The sealing condition of the spark plug, cylinder head, and crankshaft directly affects the engine's performance. Over time, the carburetor may become clogged, leading to engine stalling. Overly Rich Air-Fuel Mixture: If the engine valves are too tight, excessive black smoke may appear when stalling. After adjusting the carburetor's air-fuel mixture, the spark plug should be replaced.