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'01 XR70 cutting out

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I just picked up a used '01 XR70 for my daughter to replace her stolen CRF70 (long story). It cuts out when WFO in second and third. First doesn't seem to be a problem. I drained all the gas to start the trouble shooting there but that wasn't the problem. I plan on pulling the carb to check the main jet for "old gas issues" but thought I should check here first. Tell me it's as easy as a dirty main jet. The coil is my next guess.

Thanks!

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I would also check the gap on the spark, check the valves, re-clean air filter even if it appears clean. It could have old caked on oil on it. Does it happen after the bike warms up? If yes, it could indeed be the coil. As the coil warms up and expands it could be loosing spark power.

Also, this may seem obvious, make sure it's full of fresh gas. Just because you may see and hear gas slashing around in the lower part of the tank, it may not be enough to run properly

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