Hi I got a Yamaha dt 125 r 1998 , I got it recently for my birthday it's got a full dep pipe exhaust system on it and the two stroke was turnt up , the man who I bought it of jetted it up one cause he put the pipe on but the spark plug keeps burning out after a couple of hours riding it then I put a new on in and it's fine can all one help ? Would really appreciate it
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