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  1. 05 yfz 490 big bore stalling problem

    Yamaha YFZ450/450R (2004-Present)
    well i just bought this quad and the guy that i got it from had the big bore kit put in by a local shop here about a year ago, they built it and tuned it and the guy said they had one trip to the dunes with it and it ran perfect.. well the first thing i did is took it to the dunes and what was...
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