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my 03 kx 125 was taken to the shop for carb repair last week and after two hours of riding damaged piston rings and cylinder. repair shop insist timing, coil or black box caused burn-up. three other mechanics said running lean. is this something that can be repaired by novice?
 

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If it is running lean try ajusting the air screw or raise the clip up a notch.
Yep I would say it was a novice job.
If that doesn't cure it then it could get expensive :oops:
 

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Another old dirt bike guy
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If it is lean enough to waste a piston, I would be looking at the main jet size too!
Anyone with common sense and some mechanical ability can do a top end on a two stroke. Get yourself a factory manual, read the section on doing the top end, and make sure you understand the proceedure before starting in on it. If you don't understand what is to be done, and how it is to be done, then enlist the help of someone who does know how to do this, have them show you the first time.
 
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