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Master
747 Answers
- Posted on Dec 23, 2010
Re: I need to know if boring out my 2000 rm 125 .080...
That's a lot out of that cylinder, most I've ever gone is 50k and up a size in main jet. Read the plug after a short run and see if it's a nice tan to even light brown color. If it looks white then go up 1.5 size from the original.
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