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Discussion Starter #1
I tried to rebuild a mikuni sbn44 on a 92 waverunner 111. Upon first install (after first attempt at carb rebuild) i had no vacuum. Went over the blow up schematic and noticed I didnt put the checkvalves in with the stripe pointing up. I installed a new jet (the one with the removable seat) and corrected the checkvalves, reinstalled and same thing. The rebuild kit had the fuel pump diaphrams which I installed as well. The ski has pretty good compression 135lbs. both plugs. There is a decent pulse. No I did not put the hoses back wrong. Pulse to the block, upper to the supply , lower to the return. I used an external tank which removes all the fuel lines from the equation and still the same thing.
I believe it still has to be the carb (fuel pump) but this schematic does not look that complicated. Most of the fuel pump gaskets and diaphram look to only go together one way. I can spring for a new carb but damn do I feel stupid. Has anyone here had the same prob before? I also got a primer ball and it fills the filter (new) and the ski runs until the filter is dry. No vacuum. Thanks for your help.
 

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Discussion Starter #3
still no vacuum

Nope, no crease. I replaced the check valves and this time put the stripe up. They look fine. I used a feeler gauge on the rocker to the jet valve like the manual said also. I took the fuel pump apart to verify that the diaphrams were in the correct order and it all looks good.
 

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Discussion Starter #4
I think i found the problem, unfortunately after buying a new carb. If you read my first post it says I have the upper carb hose going to the supply and the return on the lower. When I put in the new carb it still wouldnt run. (except when i poured fuel down the throught) I pulled upper hose that I thought was the supply and fuel squirted out so I guessed that is the return. I did label them before i touched anything so the previose owner must have messed around with them. I swapped them and it stays running. Sounds like only 1 piston though. Hopefully I just fouled a plug, or need a wire.(hope its not the ignition) but I'll figure that out. What a nitwit. I probably rebuilt the old carb just fine. 200$ lesson. The manual shows supply on the lower nipple too. Sound right to you guys? Thanks for your help. I am bummed, but maybe if i get it firing right and get on the water Ill feel better.
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