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Discussion Starter #1
I have a 2001 Polaris Magnum 325 4x4 it starts up first crank and idles fine. When I would ride it through the level field below my house it would run fine. When I take it up the road I live by, I get so far up the mountain and it shuts off. So I rebuilt the carb and I can ride it with no issue with the airbox off but when I put the airbox back on it bogs and loses power. I’m stumped PLEASE HELP!!
 

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It's running too rich with the top on the air box - either the intake duct is obstructed, the air filter is dirty or the main jet is too big
 

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Thanks changed the jet and adjusted the valves that were out of spec. Any recommendations to what oil for oil change.
 
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