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  1. #1
    Moderator OsideBill's Avatar
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    Export model GPR Carbs

    I have a set of carbs I got from an esteemed member. These are Australian market GPR carbs, I have taken some photos to show what I see different between these and US market carbs. unfortunately he had these worked on and the jetting has changed so I can't compare how they come stock. maybe someone familiar will chime in.

    • Cam for accel pump is shorter duration
    • Shaft on #3 carb is longer to accomadate the larger accel pump
    • pump feed has larger fuel inlet fitting
    • 3 oulets on accel pump
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  2. #2
    The export carbs are fitted with 1.2 N+S
    Jetting is as follows
    Main 135
    Pilot 92.5

    I am currently trying to find the carb screw settings for this carb setup

  3. #3
    I have received the following info from a guy in the UK in relation to carb screw settings for the export (eu spec)

    "Yeah,it has the accelerator pump to all 3 carbs,i got the settings from the yamaha dealer/mechanic but i decided against using them and chose to add filters,rejet,remove the accelerator and remove the chokes.Did you make sure the check valves went in the right way,if i can remember correctly,there was a line on one side that had to face upwards,not sure if that will cause your bogging and i think pop offs were something like 82psi.
    The stock settings for eu spec 1200r,which is the same engine i assume are HI,7/8 3/4 7/8
    and LOWS,11/4 11/2 15/8 in order of 1 to 3,1 being the front cylinder.

    Not sure how accurate this info is.

  4. #4
    gaz1's Avatar
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    That is what i sent you last night and i can assure you it came from a yam dealer,which was given to me as that i what my carbs were going to be set to.The check valves came to mind as you had been meticulous checking everything else but i'm sure those low speed adjusters are whats causing your problem.When you say it runs away up to 3k on the hose it's like a lean runaway,i think you need to open them.

  5. #5
    Will open them up more in mornin and see what happens. Thanks for all the help.

  6. #6
    Moderator OsideBill's Avatar
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    If it runs up to 3000 on the hose what does it do in water? if the idle is set to 1200-1300 in water it will hit higher revs with no load on the trailer.

  7. #7
    PwRToyZ's Avatar
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    Export model GPR Carbs

    Hello Bill,

    going back to those export carbs from australia, is it
    possible they have them design that way to compensate
    for altitude and climate conditions? It definitly is of better
    design since it's even across all cylinders unlike the EU model.
    I'd figure it be an easier instalation for your own primer kit?

  8. #8
    The EU carbs are setup as per the Aussie one, pump on all three carbs

  9. #9
    Moderator OsideBill's Avatar
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    The export models did not have to meet the US emissions laws, they shipped with a D-plate. The thing I can't understand is the big main jet, must have something to do with the 1.2 N&S and how much fuel it flows. As for using it for a primer many people do this, I use the oil inlet holes as well.

  10. #10
    hey bill those jet sizes u told me that was in your post are they still ok for my carb which are aussie?

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