Results 1 to 4 of 4
  1. #1

    gp1200 dome and o-ring

    I have a 98gp1200 and when riding it started to bog down, I found that there is gas coming up from the middle spark plug so I pulled the plug and there was absolutley no gap it was actually touching, and these spark plugs are brand new and they were gapped. i was told that it could be that there is water getting past the o-ring and causing hydraulic pressure to push the gap closed. also when i bought the bike they said the middle cylinder had more psi than the others and I needed to change the dome and we never changed it. what do you think? also if it is the dome how do I know what size dome to get?

  2. #2
    Moderator OsideBill's Avatar
    Join Date
    Mar 2006
    United States
    Welcome Asia,

    First thing to do is get the head off and see what is inside. If you can post some pics to us we can point you in the right direction.

  3. #3
    I've never really worked on this ski or any other but have done a shit load of work to bikes and cars. I'm not in front of the ski right now but what do I have to remove to get the head off?

  4. #4
    Flying Scotsman's Avatar
    Join Date
    May 2006
    The only time i saw plugs do that the piston was toast.
    You are going to need a piston and a dome most likely.
    Did you do a compression test and determine the piston is good ?
    Pull the head and post pics,do a comp test first if you have a gauge.
    Dome size is on the outer edge of the dome usually.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. WTB - Parts Looking for a NEW solas xo and wear ring housing for a 97-99 gp1200
    By fosgate99 in forum Yamaha Classifieds
    Replies: 0
    Last Post: 04-19-2012, 09:57 AM
  2. 98 GP1200 Starting and Running Issues
    By renee in forum Yamaha Old School Skis
    Replies: 14
    Last Post: 07-09-2008, 08:49 AM
  3. Riva Stg 1 and wear ring plastic
    By DaveC in forum 4-Tec Performance
    Replies: 5
    Last Post: 06-29-2007, 09:50 PM
  4. TIP - Bar Extensions and Wear Ring Info
    By MikeTrin in forum Sea Doo How To & FAQs
    Replies: 7
    Last Post: 06-19-2007, 03:05 PM
  5. WTB: 97 GP1200 stock and aftermarket parts
    By 2lick in forum Yamaha Old School Skis
    Replies: 3
    Last Post: 02-20-2007, 09:09 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