Results 1 to 5 of 5
  1. #1

    Question GP1200R 2001 - One Oily Plug

    So what does it mean when one of the plugs is oily? Its a new plug with 30 minutes of time on it. The other 2 plugs look clean...

    We are not premixing, still using the oil injection system. So is it running lean on that cylinder and there is therefore more oil than fuel and the plug is getting coated? Or is it running rich on that cylinder? The sparkplugs get pulled after every outing due to the oil buildup on that one.

    Unit runs fairly well but is a bit more smoky at idle than the other Yamaha 2 stroke ski we got and sometimes dies when you gun it after sitting still for 15 seconds or more.

    I have read up here on the site over the past 5 days on adjusting the carbs but have not found anything about an oily plug and what that might indicate.

    BTW, this site in an invaluable tool to the shade tree ski mechanic. Awsome information! I love the search tool, I just wish the basic troubleshooting information could be setup easier for dim wits like me to browse through. But thanks for this awsome site!
    Last edited by barrettabney; 10-09-2009 at 12:04 PM. Reason: Restate issue


  2. #2
    Banned User
    Join Date
    Aug 2009
    Location
    Charlotte, NC
    Posts
    343
    Check your compression.

  3. #3
    Quote Originally Posted by fzr100098 View Post
    Check your compression.
    I'm curious to see what others say. It's two stoke so........ what would cause that? A gasket? spark plug? worn rings??

  4. #4
    Banned User
    Join Date
    Aug 2009
    Location
    Charlotte, NC
    Posts
    343
    If that cylinder is low on compression it may not be running at proper temp, leading to wet fouling.

  5. #5
    Quote Originally Posted by fzr100098 View Post
    If that cylinder is low on compression it may not be running at proper temp, leading to wet fouling.
    Pressure tested to 125 on this >100 hr engine.

    In my feeble attempt to hypothesize a reason I was thinking that since the low speed carb adjustment has no effect on the oil injector that maybe the last owner maladjusted the low end, causing the plug to coat with oil since there was not enough gas to wash it on each cycle before combustion.

    (Am taking them out today to see if I can tune the oil issue out. I was hoping to get a response, but I guess this is an uncommon issue.)
    Last edited by barrettabney; 10-10-2009 at 10:26 AM. Reason: Added info

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Sellin A Gp1200r 2001
    By Fabian_1 in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 07-18-2008, 05:49 PM
  2. Need LFH Again On GP1200R 2001
    By YOUNGGUNZ403 in forum Yamaha PWC Performance (2-stroke)
    Replies: 13
    Last Post: 07-01-2008, 09:34 PM
  3. Modded GP1200R 2001 F/S, runs but not good
    By wademcgee in forum Yamaha 2 Stroke Skis
    Replies: 8
    Last Post: 06-29-2008, 07:03 PM
  4. Modded GP1200R 2001 F/S, runs but not good
    By wademcgee in forum Yamaha Classifieds
    Replies: 8
    Last Post: 06-29-2008, 07:03 PM
  5. GP1200R 2001 Rejetted Carbs
    By Ramps in forum Yamaha PWC Performance (2-stroke)
    Replies: 57
    Last Post: 02-03-2008, 08:27 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
  •