Results 1 to 3 of 3
  1. #1

    GP1200R carb running lean?

    I have a 2001 XR1800 with two of the same motors that are in the GP1200R. I just rebuilt my carbs and it seems to be running too lean. It falls on its face when you go from idle to full throttle. If I pull the choke out 1/16 – 1/4 it seems to run better all the way through the rpm range. Should I lower my spring to a 95G?
    I went with the 115g because I read that Group K was able to get rid of the “no wake idling bog” by increasing the spring size from the 95G to 115G in the XR1800.

    What I have installed
    120 main
    110 pilot
    1.5 N&S
    115G spring
    T-handle low adjustment
    Rebuilt accelerator pump

    Thanks for your help.

  2. #2
    OK I took out the 115g spring and replaced it with the 95g spring and it is still running lean. With the choke pulled out 1/8 – ¼ of the way it runs great, but if the choke is pushed all the way in; it dies once the throttle is touched. I tried to adjust the low side adjustment screw in and out and this did not help. I do not see why it would be running lean. I increased the sizes of the main jet, pilot jet and needle and seat.

  3. #3

    Join Date
    Jun 2012
    Amity Harbor, New York, United States
    hey i got a rebuild kit and im not sure which spring i should use and how to tell which one is which?

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. XR1800 carb running lean?
    By axelz in forum Yamaha Sport Boat
    Replies: 3
    Last Post: 09-20-2014, 01:22 PM
  2. GP1200r carbs running to lean
    By dirtyski in forum Yamaha PWC Performance (2-stroke)
    Replies: 11
    Last Post: 07-22-2010, 09:32 PM
  3. Gp1200r Carbs
    By sic fish in forum Yamaha PWC Performance (2-stroke)
    Replies: 1
    Last Post: 03-13-2007, 03:39 PM
  4. GP1200R Carb modification
    By croskel in forum Yamaha PWC Performance (2-stroke)
    Replies: 3
    Last Post: 05-15-2006, 11:03 AM
  5. Nils old news on running lean
    By Kinchyle in forum 4-Tec Performance
    Replies: 4
    Last Post: 03-24-2006, 01:01 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