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  1. #91
    Adam's Avatar
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    Aug 2005
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    Australia
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    I haven’t seen a check valve fail with this modification, I believe it takes the pressure spike off the check valve and prolongs their life . Diaphragms fail before the check valves and fuel pressure drops . As you said rebuild every 3 yrs to keep everything reliable. I have just pulled apart my carbs after I noticed the pressure drop on the gauge I have installed. Diaphragm is leaking pulse pressure and not keeping up with fuel demand of my Triple piped GP1200R , better safe than sorry.

  2. #92
    So how do you check fuel pressure on carbs. without this mod. ????

  3. #93
    Yamaha artisan Cutlass's Avatar
    Join Date
    Oct 2010
    Location
    Madison, WI, USA
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    2,562
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    Quote Originally Posted by kartracer View Post
    So how do you check fuel pressure on carbs. without this mod. ????
    You can’t.

  4. #94

    Join Date
    Nov 2017
    Location
    The Shores, Mitten
    Posts
    119
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    6
    95 main jets are hard to come by locally (M5 thread, 6mm round head). I have the old 95 pilot jets, but those are 4mm threads so won't screw into that last nipple. Here is one alternative to using the 95 pilot jet for the return using vacuum line couplers. I soaked one in gas last year and nothing happened fyi.

    1/4" and 1/8" nipples, drill out the 1/4" to size so the 1/8" friction fits, tap the 1/8" with M4 thread and finally trim them down to insert into the hose:









    And I did tap the last nipple so confirm it works. I only have a M5x0.8 tap, so the M5x0.7 jet will go half-way and start "self locking itself" which might be a good thing but could be a disaster to service/clean cause you might not be able to remove it:



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