Results 1 to 3 of 3
  1. #1

    Join Date
    Sep 2012
    Location
    OC
    Posts
    7

    '90 550sx running weird

    I have a '90 550sx with a coffman halfpipe and a water box, everything else stock, that runs great but only if I don't let it idle for very long. If it idles for more than 30 seconds it won't rev up no matter what. When it gets like that I have to shut it off for a minute or two and then fire it up and ride away. Once it gets going it runs perfectly normal. I have been stumped by this for a while and have just put up with it but have now decided that it is time to sort out the issue. Compression in both cylinders is in the 120-125 range and it has a new head gasket, spark plugs, and a fresh carb rebuild. Any help would be greatly appreciated


  2. #2
    Sounds like your pilot fuel setting is set too rich and engine is getting flooded.
    You may want to make it little leaner by scrweing in the pilot screw like 1/4 turn at a time.

  3. #3

    Join Date
    Sep 2012
    Location
    OC
    Posts
    7
    Thank you, I had ruled out carb settings because one of the times I took it out before I realized that if I let it sit it would run I tried playing with the carb but nothing worked. Now that I think about it though, all these issues started after I messed with the settings a few months ago. I will try that and hopefully it will work.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 951 GSX runs weird - seems like ignition but?
    By OldSchoolRotax in forum 2-Stroke Performance
    Replies: 4
    Last Post: 10-14-2012, 07:50 AM
  2. GPR running weird
    By ars2xltraider in forum Yamaha PWC Performance (2-stroke)
    Replies: 8
    Last Post: 07-15-2012, 07:54 AM
  3. 90 650 runs great for 20 seconds then dies out.
    By andersonn in forum Yamaha Old School Skis
    Replies: 6
    Last Post: 07-24-2011, 12:24 AM
  4. 90 650 runs great for 20 seconds then dies out.
    By andersonn in forum Yamaha PWC Performance (2-stroke)
    Replies: 0
    Last Post: 07-16-2011, 04:36 PM
  5. 95 slx first lake run! Weird issue. Need advise.
    By friscoboater in forum Polaris Open Discussion
    Replies: 5
    Last Post: 06-27-2010, 02:00 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
  •