I have an old Honda stunner registered in 2009 (CBF125M). Since one year i am facing an issue in my bike that in every 20-30 days the spark plug turns black, which results in starting problem. I have tried several ways (piston change, valve seal repair, spark plug change) but it didn't work at all. Please let me know due to how many reasons it happens and what is the solution for this issue?
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