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Mend Jinlun 125 Spark Plug Black

Spark plug black?

l replaced the spark plugs with new ones yesterday in my Jinlun 125 l took them out to day and one was black any ideas why?????????

Tony
April 2009
JinlunJinlun 125Vehicles, MotorcyclesSpark Plug Black
A black, sooty plug indicates a rich mixture - may need the carbs balancing if there's 2.

John
April 2009

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Jinlun 125: Black Spark Plug - Causes & Fixes