Results 1 to 2 of 2

Thread: '99 GP800 Probs

  1. #1
    Buaidh No Bas howestek's Avatar
    Join Date
    May 2005
    Location
    Louisiana
    Posts
    917

    '99 GP800 Probs

    Back cylinder tested 90 psi. Pulled head and saw front cylinder with good wash, back cylinder dry with small indentions in the piston head on the exhaust side. I pulled the cylinder and some scoring was evident, especially on the intake side. I then rotated the crank and heard noise .The rear piston was sloppy and lo and behold, I couldn't see any crank rod bearings left. Front bearing looks good. Some debris in the case with the oil.
    My question is basically, which way to go from here??
    Is it possible that I just need to replace the rod bearings with new pistons/rings plus a renik job?
    Any advice appreciated.


  2. #2
    cfgp927's Avatar
    Join Date
    Dec 2005
    Location
    Warsaw, Missouri
    Posts
    622
    I would exchange the cylinder with one from Millenium Technologies and rebuild or buy another crank. It just so happens I have a new crank with less than 1hr on it I'd be willing to sell. There's factory pistons on e-bay right now. I also have a 0hr head for sale.
    Mike

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 99 GP800 Compression/Head?
    By CustomGP800 in forum Yamaha Old School Skis
    Replies: 8
    Last Post: 08-08-2008, 09:52 AM
  2. WTB '99 GP800 Drive shaft AND Impeller ASAP!
    By ProXR 440 in forum Yamaha Classifieds
    Replies: 4
    Last Post: 07-16-2008, 05:47 PM
  3. WTB!! Servo motor for 99 GP800!
    By CustomGP800 in forum Yamaha Classifieds
    Replies: 1
    Last Post: 07-14-2008, 01:58 PM
  4. 99 GP800 lost a cylinder
    By johnsonmtz in forum Yamaha Open Discussion
    Replies: 0
    Last Post: 07-23-2007, 09:51 AM
  5. 99 gp800 lost all power, 5mph tops, help me
    By lifted99f250 in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 07-03-2007, 01:43 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •