Need help with 2001 Yamaha Gp800R

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  1. #1
    PWCToday Newbie
    Join Date
    Jul 2017
    North Carolina

    Need help with 2001 Yamaha Gp800R

    I have a Gp800R that I received for free from a neighbor and its in great condition but it has a problem when I turn it on and let it idle and it shakes a lot out of the water it almost sounds like the entire engine is loose but I checked it and it's not. We did check the compression and the back cylinder is about 120-124 and the front on the first check was about 90. we added oil in the oil tank and added 8oz of marine 2stroke oil in the gas tank with a full tank of gas. we did another compression check after about 30 minutes of riding the back was 120-125 and the front jumped up to about 110 and we added some oil into the cylinder when we took off the spark plug and it jumped straight to 118. When I ride it, its shaky on idle but when I give it a tiny bit of gas it stops shaking and runs smooth. I clocked it full speed at 56mph (Gps). Any help would be amazing.

  2. #2 Is My Home Away From Home Grumpy Old Guy's Avatar
    Join Date
    Dec 2003
    Sunny Fla

    Re: Need help with 2001 Yamaha Gp800R

    Time for a rebuild.

  3. #3 Is My Home Away From Home kcr357's Avatar
    Join Date
    Sep 2008
    The flakka capitol of Florida

    Re: Need help with 2001 Yamaha Gp800R

    Grab the engine and try to rock it around. Might have a bad motor mount.
    Also, replace the oil injection lines and get updated power valve retainers. <<<<
    How many gerbils could a gerbil jammer jam if a gerbil jammer could jam gerbils?

    "You build cheater motor's & still get smoked !!!!"
    "Its not your fault. You just don't understand what you're talking about. "

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