Bajaj Caliber Fouling Spark Plug
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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
A: If your plug is black and sooty at idle or low throttle settings, I’d try leaning out the idle mixture by 1/4 to 1/2 a turn. You may have to increase the idle speed if you do that, and you may find it stumbling a bit as you open the throttle. Oftentimes, I’ll adjust the idle a little rich so that acceleration is smoother as you open the throttle. If the plug is just black and not fouling, that may be the best compromise. (Note: A follow-up email from Ricardo says this worked.) MC
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