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My ole man has a 01 mxz 600, while riding down a trail holding consistant speed around 40mph from time to time the mag side likes to foul out. i have been throu the carbs more than once every thing seems to be in synch. so i did a comp test on it and the mag side is reading 140 and the pto side 160psi wich is about a 12.5% diff where do i go from here all in put is apperciated. thanks :devil:
 

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either run a hotter plug on that side or replace rings in both cylinders before you start in on changing jets in carbs :D
 

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What are you using for oil ? try changing brands and see if that helps.
 

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Ok finally someone has the SAME EXACT problem as me. its about time! the bulletin they have on the 01's fixes that problem. they re-adjust the pilots, and do different needles.
 
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