99 suv carb/elec issues?

[TWINSTACK1]

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 (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

[Technical Support]

Re: 99 suv carb/elec issues?

Run a fuel line directly from the tank to the carbs, see if you get better fuel delivery also what did you set the pop-off to?

[TWINSTACK1]

Re: 99 suv carb/elec issues?

40 ish is what I "think" it is. I know stock is around 50. My old guage is a lit sketchy, so I ordered another today. I'll report when it comes in.

[Technical Support]

Re: 99 suv carb/elec issues?

Ok sounds good, shoot for 50 to 55

[TWINSTACK1]

Re: 99 suv carb/elec issues?

Lil side note while I'm waiting on new guage...... I checked the inline primer bulb. It seems to be working fine. No leaks detected and seems to pump up fuel nicely.
Cooooommmmeee Onnnnn UPS!

[TWINSTACK1]

Re: 99 suv carb/elec issues?

Got the new guage. Once I got fuel pump to stop leaking air,...... I got over 60 pds before needle popped off. Changed to "copper" spring and no difference. Put in weaker of the two springs in the kit and got 40. Broad disparity.

[Technical Support]

Re: 99 suv carb/elec issues?

Does it run any different?

[TWINSTACK1]

Re: 99 suv carb/elec issues?

Haven't tried it yet; carbs still on work bench. Worked with springs til I settled for 50. Gonna work with the other 2 today at the shop when i can. Trip to the river is iffy this weekend, atm.

[TWINSTACK1]

Re: 99 suv carb/elec issues?

Went back through carbs. All is good, pop off, ect. New motor still runs like crap. Plugs are getting fuel. Only thing so far I haven't checked is the resistor caps.
If that don't do it.. binary explosives are next.

[TWINSTACK1]

Re: 99 suv carb/elec issues?

The above repairs did the trick. Thanks

[dtd6string]

Re: 99 suv carb/elec issues?

What was it? . . Pop off too low?.. On my 99 PV motor, 50psi was way too low. set it to 75psi and it runs good. (IDK what the n/s sizes are - stock) My 99 Non-Pv motor 50psi seems to be the magic number.

[TWINSTACK1]

Re: 99 suv carb/elec issues?

All three initially were over 65 psi. I changed springs and messaged all three to around 55ish. I also modified the carbs fuel delivery to be synchronous pressure regulated per Bill's modification (O'SIDE BILL). Runs very well.