Results 1 to 3 of 3
  1. #1

    Join Date
    Jul 2009
    Location
    hudson florida
    Posts
    1

    Cool gp 800 compresion

    my sons 800 has 95 lbs in one cylinder the other is 120lbs I know they should both be 120 - 125 or so, but it seems to run fine. should I do the top end, or can he ride it like it is?


  2. #2

    Join Date
    Jun 2008
    Location
    Tyler, Texas
    Posts
    18
    It should be ok to ride for now, just keep your eye on it. Drop a tablespoon of 2 cycle oil in the spark plug hole in the low cylinder and check compression again. If the compression rises, then you'll have some idea that your cylinder, piston, and or rings may have some damage.

  3. #3

    Join Date
    Jan 2009
    Location
    Rising Sun,Md
    Posts
    31
    The sooner you fix it,the less cylinder damage they'll be.Just my opinion.I'd at least pull the head and see what's going on.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. starter question on a 98 gp 800
    By spyder3000gtvr4 in forum Yamaha Old School Skis
    Replies: 1
    Last Post: 07-29-2007, 09:40 AM
  2. gp 800 jetting
    By fx 6.9 in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 06-05-2007, 05:04 PM
  3. 99 gp 800 needs a wake up.
    By team11haro in forum Yamaha PWC Performance (2-stroke)
    Replies: 2
    Last Post: 04-29-2007, 07:40 PM
  4. 99 gp 800 issues
    By 1stskiguy in forum Yamaha Open Discussion
    Replies: 1
    Last Post: 04-18-2007, 10:55 AM
  5. 1999 gp 800
    By Island racer in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 05-27-2006, 01:30 PM

Posting Permissions

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