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xr80r sputtering


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I just bought my 12 yr old a 1993 xr80r. It's sputerring on the top end. Starts fine. replaced the fuel with new. Plug is super black. Plug gets black after 10 min. of riding. The bike looses power at high rev. and speed in 2nd thru 5th. Any help would be appreciated by me and more importantly my 12 year old.

Thanks.

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any thought on carb.. If I'm running rich, how can I correct the mixture. I'm not familiar with this carb and I know "tweaking" any carb is not a good idea unless you know what your tweaking.

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