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  1. #1
    twinstack1 twinstack1's Avatar
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    99 suv carb/elec issues?

    Just installed s/b in this ski. Took it out last weekend and it ran ok for break in. Now, the ski will not get up on plane, as if starving for fuel. I have rebuilt the carbs (carb pop off in spec) and all seems to be ok. I isolated each carb outlet with a fuel line from each outlet into a catch tank. In all my (limited) experience, the fuel pumps should be putting out "gushes" of fuel. All three pumps barely push the fuel up the lines and trickle out into the can. Wondering if I should gut/cap sbn carb pumps and install remote pumps ones like I used to on the polaris ski's. Thoughts?
    This is the 2nd s/b I have installed in this ski for lean condition. The last one I assumed had failed because of the pto seal came out and took a ride on the crank snout.
    Anyone know if these yamahas have the same old probs the polaris' models had with poor fuel pumping and/or electrical probs with wires/boots?
    FYI: CHECKED COMP AFTER PROB OCCURED 115ish on all three


  2. #2
    twinstack1 twinstack1's Avatar
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    Cool, that's what I was thinking too. I'll check that.

  3. #3
    Moderator OsideBill's Avatar
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    there is a .020" hole letting fuel out of each fuel pump. Gushes you will not see.

  4. #4
    Moderator OsideBill's Avatar
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    If you want to take the worry out of your fuel pumps do the drilled return modification. I drill the .020" hole out to .125" (1/8") in all three carbs then tap the last tee in the return line on carb #1 with a 5mm tap, then install a 105 main jet in that line to control fuel pressure. Now all three carbs are a single pressurized systemand if any fuel pump starts to fail the other two will assist that carb.

  5. #5
    twinstack1 twinstack1's Avatar
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    OB, did I mention that this thing is bone stock? I'm missing something, more than likely simple, somewhere. All three are getting fuel equally. Before I go any further, I just ordered a new 0-60 guage to verify pop off. My old guage has been acting weird as of late, so before I go further looking for a prob that ain't there, I'm gonna start over. Use the KISS acronym.
    I'm looking for 40ish psi for decent pressure?

  6. #6
    Moderator OsideBill's Avatar
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    stock is 52 PSI

  7. #7
    Moderator OsideBill's Avatar
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  8. #8
    twinstack1 twinstack1's Avatar
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    Got it OB.. and tyvm. I'm ready to install the return jet but only have a 120 handy. 105 I assume is critical?

    If so, I'm gonna need one.

  9. #9
    Moderator OsideBill's Avatar
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    yeah you will not get enough fuel pressure with the 120

  10. #10
    twinstack1 twinstack1's Avatar
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    Click image for larger version. 

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    Got the returns drilled and restrictor installed. Still waiting on new 0-60 guage.. tic toc, tic toc

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