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01 CR 125 Mid - Top end sputter

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I have an 01 CR125 I just bought the bike for a steal of a deal figureing i could fix this problem. I have no history on the bike other than it didn't run right. I just replaced the top end so i have maybe 30 min on it. The problem is the motor is flat = no mid to top end power. It pulls ok up till maybe 1/4 to 1/3 throttle then it falls flat on its face. If i roll on to the throttle it pull's better than just twisting wide open and once the Rpm's come up to 3/4 throttle it starts to sputter on and off the power. I can tell the power is there because when it is sputtering it pull's hard then fall's off and it happen's fairly rappidly.

Any other idea's would be greatly appreciated!!

I have tried.

jetting up and down from 380- 320

eliminating the power valve (as in keeping it in the wide open position.) Ithought the PV govenor was faulty

Checked the Reeds

Changed the plug

Fresh fuel

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The pipe is somewhat gunked up but nothing that i could see that should affect the power that much. I am leaning more towards a bad coil or bad pick up on the stator.

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For anyone that comes across this post i have fixed the problem. I pretty much dismantled the entire ignition system and cleaned everything and re asembled it. I did so much at one time that i can't pin point the fix exactly but i think it was a grounding issue with the coil. There was lot's of corrosion on the coil mounts and on the coil it's self. there was also a bit of rust on the fly wheel do to moisture in the side cover I removed the fly wheel and stator and cleaned everything with electrical contact cleaner and scrubed the little bit of rust off with a scotch bright pad then reassembled everyting. The bike run's strong now and i hope this post can help someone else down the road with a simular problem.

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put in a new plug, cleaned up air filter, new oil, and also put your air to fuel screw back to stock settings so 1.5 turns out from snug then go from there

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