Results 1 to 3 of 3
  1. #1
    brisyl's Avatar
    Join Date
    Feb 2009
    Location
    New Brunswick, Canada
    Posts
    681
    +1
    59

    gp 1300r tuning question

    I have a 2003 gp1300r that is running great but i think is running lean in the 2000 to 5000 rpm range cause i can hear a (blup,blup,blup) sound that i think that is call (flat spot). the engine is running great, it don't die or surge but i always hear that sound that i want to get rid off. it can easely be heard from the shore.
    When i bought the ski,the previous owner had put in NGK BR8HS instead of BR8ES in it. The BR8HS tread is about 1/4 inch shorter then the BR8ES and when i rode the ski with the BR8HS the flat spot is reduce by half, it must be cause by the combustion chamber volume being a little bit larger due to the gap left by the plug.
    That why i'm guessing that it is running lean.

    So is there a way to richen the mixture on a gp1300 without buying a $400 efi control module


  2. #2
    That sound is normal for a 3 cylinder 2 stroke, they all do it.

  3. #3
    brisyl's Avatar
    Join Date
    Feb 2009
    Location
    New Brunswick, Canada
    Posts
    681
    +1
    59
    ok thank's, but how do you call that sound? is it a flat spot

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. 06 GP 1300R Flush
    By Toobold in forum Yamaha PWC Performance (2-stroke)
    Replies: 4
    Last Post: 03-15-2007, 02:27 PM
  2. Gp 1200 Carbie Questions 99 model
    By murzwern in forum Yamaha Open Discussion
    Replies: 9
    Last Post: 01-17-2007, 08:11 AM
  3. 05 1300r jet question if adapting carbs
    By Soto in forum Yamaha PWC Performance (2-stroke)
    Replies: 0
    Last Post: 08-11-2006, 02:51 PM
  4. Carb tuning questions - need to fix bogging
    By Byteme in forum Yamaha PWC Performance (2-stroke)
    Replies: 24
    Last Post: 07-22-2006, 08:14 PM
  5. Stock 2006 Yamaha GP 1300R Rpms?
    By Toobold in forum Yamaha PWC Performance (2-stroke)
    Replies: 5
    Last Post: 07-18-2006, 05:07 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
  •