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yz 125 problems

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ok so i have an 01 yz 125 that i already knew had somewhat low compression. but it still ran beautifully barley any bogging. now it is fouling out plugs left and right. like if i go for a lap around a track or for a hill climb it bogs out and fouls the plug. i tested the compression and im at about 85-90 so i know i need a top end. but i just want to get a more experienced opinion. the bike runs after i put a new plug in or i clean the old plug. but then shortly ater it bogs out and dies once more. so i guess its a new top end? or could it just be bad plugs aswell?

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alright thanks guys will do, just wanted to make sure i didnt need anything elese to fix the problem

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