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Sputtering at half throttle

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Good evening tt! New guy here! I have an 01 yz125 i fully restored and rebuilt from ground up. However i am now hitting an issue with the bike where it is breaking up half throttle, seemingly right before powerband. This occurs on or of choke too.The bike is all stock aside from New top end and bottom end and seals, which are all stock spec. My carburetor and jetting all checks out. My reeds are good. It has a brand new plug and new fuel. The bike has been set up like this for almost 2 years and has been running great until last week. Im thinking it may be ignition related but would appreciate any second opinions. Thank you! 

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