Bajaj Caliber Fouling Spark Plug

Reader Contribution by Keith Fellenstein
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Fouling spark plug

Q: My motorbike is a Bajaj Caliber. The spark plug on it is a light brown on long trips, but if I check the plug after a short journey or when it’s just been idling for a bit, the plug tip is black. Why is this and how can I overcome this problem? — Ricardo P./via email

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