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Message: [QUOTE="Porstala F9, post: 753577, member: 44905"] Kids where I live with 80s go [b]well[/b] over 115 hours without even looking at the piston. And throughout this time, maybe cleaning the air filter maybe once or twice. Amazing how people neglect their bikes. But the suprising thing here is, a lot of their bikes still luckily as anything, run fine. But it can't hurt to check out the piston :thumb: And I agree to adjust the jetting! Since I have adjusted the jetting on my kx125, not only has throttle response and performance been better, but I have so far went from fouling a spark plug every other ride, to so far since I have jetted, 15 days of riding and counting :yeehaw: [/QUOTE]