missfire/splutter

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missfire/splutter
Bike type: 

Please help?! My bike developed a splutter/missfire mostly through the lower gears it seems worse as if my power valve is struggling to operate however I have been through anything it could be plug blocked carb tried new air filter I then took my engine apart checked the adjuster in bottom end seemed to be fine a little play tho which I took out (did not change a thing) I replaced my piston and gaskets top end everything seems fine??? Please someone help I haven't had a proper ride in 2 months!