97 Xp 787 Runs but won't start

[fletcheyp]

1997 Seadoo XP 800 carbureted

I just rebuilt the top end of my 787, 120 psi on both cylinders.

It has spark with fresh spark plugs

It turns over when I click start but won't fire up, (with or without choke or throttle)

When I pour fuel in the intake through the carbs and click start, it fires up and idles.
it revs up fine and doesn't die.
I have hooked it up to the hose and let it run and all seems fine.
Once it has run I can shut it off and restart it easily.
if it sits for more than a few minutes it won't startup again without another squirt of fuel in the intake.

Looking for advice on what the problem might be, hoping I don't need to rebuild the carbs completely.

Thanks,
Fletcher

 

[artr]

120 psi seems low for a 787. It may start and run out of the water but will have difficulty under load.

 

[fletcheyp]

120 psi seems low for a 787. It may start and run out of the water but will have difficulty under load.

I'm water testing tomorrow, so I'll see how it runs under load. Would that have an impact on starting though?

 

[artr]

It may not start in the water, or die after starting.

 

[artr]

Also, make sure you are using a good quality compression gauge.

 

[mikidymac]

Sounds like a fuel issue and low compression.

You had better rebuilt the carbs with Genuine Mikuni parts and serviced the fuel system with a new engine.