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What causes an EFI motorcycle to jerk at low speeds but run normally at high speeds?

1 Answers

VonAdrian

07/25/25 10:47am

An EFI motorcycle jerks when riding but idles normally. This is likely due to a faulty spark plug. Spark plug leakage can cause engine misfire, which is not obvious at idle but becomes noticeable when riding. Replacing the spark plug can resolve the issue. Steps to replace the spark plug: 1. Grab the high-voltage cap with your hand and pull it upward firmly to remove it. 2. Attach the spark plug tool. 3. Rotate counterclockwise to remove the old spark plug. 4. Install the new spark plug to complete the process. Function of the spark plug: The spark plug is a critical component of a gasoline engine's ignition system. It introduces high-voltage electricity into the combustion chamber and generates a spark across the electrode gap to ignite the air-fuel mixture in the cylinder. It mainly consists of a terminal nut, insulator, terminal stud, center electrode, side electrode, and shell, with the side electrode welded to the shell.

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