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What are the symptoms of a damaged motorcycle spark plug?

2 Answers

VonCody

08/31/25 6:13am

Symptoms indicating that a motorcycle spark plug is faulty and needs replacement: difficulty starting, reduced power, excessive exhaust emissions, and increased fuel consumption; severe spark plug damage with symptoms such as blistering at the tip, black streaks, cracking, or electrode melting. Methods to determine if a spark plug is damaged: Remove the spark plug and observe its condition based on the following appearance colors. A normal spark plug's insulator skirt and electrodes should appear gray-white, gray-yellow, or light brown. A properly functioning spark plug will have a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is contaminated with oil or deposits but is not damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, showing blistering at the tip, black streaks, cracking, or electrode melting, the cause of the damage should be identified. After troubleshooting, replace the spark plug with a new one. Additionally, if the spark plug appears black as if smoked, it indicates the wrong heat range was selected or the air-fuel mixture is too rich, with oil seeping up.

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StAnthony

09/13/25 2:40am

I've been riding motorcycles for over ten years, and the symptoms of a bad spark plug are really annoying. The most obvious sign is difficulty starting the engine—sometimes you turn the key for ages and it just won't fire up, forcing you to try repeatedly. When riding, the engine vibrates intensely, especially during low-speed climbs or acceleration, making it feel unstable like dancing. The idle is also very rough, often stalling suddenly at red lights, which can be embarrassing. Fuel consumption increases significantly too—a full tank runs out after just a few hundred kilometers, clearly wasting gas. I've taken out spark plugs myself and found most covered in black carbon deposits or with burnt electrodes; cleaning or replacing them helps. Don’t overlook this small part during regular maintenance, or it’ll affect both riding experience and bike performance, even posing safety risks. A simple monthly check is recommended to save hassle.

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