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  1. Yamaha Warrior 366 big bore kit.

    Yamaha YFM350 Raptor/Warrior ('87-Present)
    Have any of yal guys done this? I read that it will be about 300 installed, but not sure if it would give any notice able gain. Just that it gives very little hp but more torque. I just figured when I rebuild it would be a good mod to do.:shrug:(if it give a notice able gain)