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Why is the motorcycle idle unstable?

2 Answers

MayaAnn

07/28/25 11:06pm

Motorcycle idle instability is due to the carburetor not being cleaned for a long time. Here is the relevant introduction about the carburetor: Definition: The carburetor is a mechanical device that mixes a certain proportion of gasoline and air under the vacuum effect generated by the engine operation. Working principle: The carburetor is essentially a tube with an adjustable plate called a throttle plate in the middle, which controls the airflow through the tube. There is a constriction in the tube called a Venturi, where a vacuum is formed. This constriction has holes that use the vacuum to draw in fuel.

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MarleyMarie

08/12/25 3:32am

Unstable motorcycle idle is really annoying, a common situation is the RPM fluctuating up and down just after starting. I've encountered this several times, usually due to excessive carbon buildup in the throttle body or a clogged air filter affecting air intake. If spark plugs haven't been replaced after tens of thousands of kilometers, electrode erosion or heavy carbon deposits can cause poor ignition. Carburetor bikes are more prone to this issue when the fuel system gets dirty, and worn needles can lead to inaccurate fuel delivery. Also, valve clearance that hasn't been adjusted for too long shows particularly noticeable differences between cold and hot engine states. Last time my bike acted up like this, I spent half a day troubleshooting only to find the idle adjustment screw had vibrated loose - a gentle twist fixed it. Remember to regularly clean the air filter and throttle body, and occasionally add some fuel system cleaner while running at high speeds to prevent this problem.

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