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Problems with a 1999 suzuki rm 125. i got spark plug problems keeps fouling plugs?

So i replaced the piston recently with a vertex piston. but now i have spark plug trouble. i put a new plug in and after about 5-10 minutes of running it just cuts out. ill take it out check for a spark and theres nothing there. The electrode is still


Check your coil ! If the coil is hot after 10mn of running the coil is pooched.I've seen this happen and people thought there was something else wrong.By the ime you check for spark and change the plug the coil can cool down enough to refire.

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