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I have a 2008 rzr ranger 800efi and it bogs at 30mph. The following is what I have done–new spark plugs–new fuel filter,pump regulater—new drive belt–air intake is clean. The machine starts fine and has a perfect idle. you can mash the gas and it runs great up to 30mph and that is where it just goes flat or bogs ! I am at a loss and would appreciate any ideas you guys might have !!! Thanks Jim

Utah RZR Rentals

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