Page 1 of 2 1 2 LastLast
Results 1 to 10 of 11
  1. #1
    paul c's Avatar
    Join Date
    Sep 2008
    Location
    mass.
    Posts
    97

    gpr low screw setting, anyone ?

    i hate to keep harping on this but i did some more test and tuning tonight and found that this thing runs rich in the low circuit. i wasn't completely sure if it was a rich sputter or a lean miss. i have always had the lows between 3/4 and 1 turn out. so i removed the stinger and set them 1 1/4 out to see and sure enough it is over rich, harder starting also. my question is are there any skis running with then 1/2 turn out? i am getting good at removing the stinger but want to bolt it in for good soon. any suggestion would be appreciated. thanks again, paul c.


  2. #2
    Just 1/8 of a turn will make a big difference on the lows. I wouldn't jump right to 1/2 just yet, try 3/4.

  3. #3
    sleeplessnMS's Avatar
    Join Date
    Mar 2006
    Location
    Waveland,MS
    Posts
    1,943
    Well if is to rich at 3/4-1 turn and way to rich at 1 1/4 I'd drop the jet size 10#'s and start at 1 1/4. If still to rich then ya can ease it down to 3/4 and it should be fine. If jetting is close it should tune in between 3/4 and 1 1/4..... NOW on cooler days be careful. The air will be changing soon!

  4. #4
    paul c's Avatar
    Join Date
    Sep 2008
    Location
    mass.
    Posts
    97
    i have the 110 pilot jets in it and the 1.5 n/s, pop off @ 42 psi. all the way down to a 100? the stock ones were 95's and i disabled the acc. pump. should i still go that low? thanks again. i already had them @ 3/4 and it was still a little rich.

  5. #5
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Location
    Minden, Nevada, United States
    Posts
    10,664
    +1
    11
    Paul, are you running choke plates? Who did your carbs?

  6. #6
    paul c's Avatar
    Join Date
    Sep 2008
    Location
    mass.
    Posts
    97
    choke plates are still there and i did the carbs with the info i got here in the carb treads.

  7. #7
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Location
    Minden, Nevada, United States
    Posts
    10,664
    +1
    11
    Ok, the choke plates will richen up the fuel with your current jetting...less air coming in. Removing choke plates is a must do for better performance.

  8. #8
    paul c's Avatar
    Join Date
    Sep 2008
    Location
    mass.
    Posts
    97
    so i should step down the pilots as mentioned in the other post? you wouldn't think they would have that much of an affect at lower rpm's. i am constantly learning w/ these 2 strokes.

  9. #9
    WATER WOODY's Avatar
    Join Date
    Aug 2005
    Location
    Minden, Nevada, United States
    Posts
    10,664
    +1
    11
    IMO, you should remove them and run the current jetting, install a primer kit.

  10. #10
    paul c's Avatar
    Join Date
    Sep 2008
    Location
    mass.
    Posts
    97
    when i remove the plates the shafts should come out too? i still have my pump in place just removed the cam off of the throttle shaft. is there a perticular kit that i should get? also i should probably put the 125 main jets back in when i remove the chokes?

Page 1 of 2 1 2 LastLast

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Replies: 2
    Last Post: 07-13-2014, 08:37 PM
  2. Replies: 3
    Last Post: 05-14-2013, 09:37 PM
  3. Anybody have the high and low screw settings on a 98 GP760 carb set?
    By dalepatter in forum Yamaha Open Discussion
    Replies: 3
    Last Post: 05-18-2012, 08:36 PM
  4. gpr 800 high speed screw setting
    By tumblingtwerp9 in forum Yamaha PWC Performance (2-stroke)
    Replies: 0
    Last Post: 07-11-2010, 07:39 PM
  5. high and low speed screw settings?
    By johnson7454 in forum Yamaha Open Discussion
    Replies: 1
    Last Post: 05-21-2008, 07:08 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
  •