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losing power

  1. Yamaha Snowmobiles
    I have a 1999 Vmax 600 twin. It starts every time 1-2 pulls and runs great. It'll rip like a brand new sled for the first 30 minutes of riding. After that, I notice some power loss, maybe 10-15% less. Around 10-20 minutes later, it won't rev about 6k, and takes up to 20-30 seconds just to get to...
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