300/440/550 Js550 Tips.???

[crazy4sand]

1983 js550

last summer i got this ski fee sat for 5 years got it rebuilt the carb new fuel lines ext a easy tune up got the tittle recently finished doing body work and restored it took it to the river last Sunday i was greatly impressed Im 17 210lbs and this thing Hauled ass with me on it

it handled completely different from my super-jet as expected more of a freestyle ski im happy with it just a few quick questions

- i have a downer parts ski in the back of my garage i believe its a 440 i was told that putting a 440 pump on a 550 is the way to go? (flat water ridging) opinions?

- In the water its hard to start i know its a old ski i just dont want to get stranded on the lake is there a fix for it?


thank you,

 

[SQUARE JOEL!!!]

There CAN be benefits to a 440 pump on a 550. I would suggest reading some threads on PWC Today, there's much more 440/550 info over there.

If you haven't installed a primer yet, that would help a lot with hard starts.

1983 js550

last summer i got this ski fee sat for 5 years got it rebuilt the carb new fuel lines ext a easy tune up got the tittle recently finished doing body work and restored it took it to the river last Sunday i was greatly impressed Im 17 210lbs and this thing Hauled ass with me on it

it handled completely different from my super-jet as expected more of a freestyle ski im happy with it just a few quick questions

- i have a downer parts ski in the back of my garage i believe its a 440 i was told that putting a 440 pump on a 550 is the way to go? (flat water ridging) opinions?

- In the water its hard to start i know its a old ski i just dont want to get stranded on the lake is there a fix for it?


thank you,

 

[ger87410]

I can't imagine why a 440 pump would be better then a 550 pump, unless they have different bores. I heard that they're interchangeable...

Do you have to sit there cranking for awhile it before it finally starts?

I'm having the same issue. I recently rebuilt the engine and haven't tried it yet, so don't know if the problem still exists.

 

[crazy4sand]

the engine was freshley rebuilt before i got it. i know i have it tuned very well. i primed the hell outta it and thankfully i got it started up as i was floating farther and farther down river. i heard putting a newer carbarator with different diraphems (spell check) helps it out.

i have to put it on a stand far enough to get the pump out of the water before it decides to start

I can't imagine why a 440 pump would be better then a 550 pump, unless they have different bores. I heard that they're interchangeable...

Do you have to sit there cranking for awhile it before it finally starts?

I'm having the same issue. I recently rebuilt the engine and haven't tried it yet, so don't know if the problem still exists.

 

[ger87410]

My guess right now is try a leak-down test.

I'll let you know Monday if that solved my problem, which sounds kinda similar to your prob.

 

[crazy4sand]

My guess right now is try a leak-down test.

I'll let you know Monday if that solved my problem, which sounds kinda similar to your prob.

Leak down test?

 

[ger87410]

That's where you're basically sealing the lower portion of the engine and testing it for leaks.

There's plates to put over the intake and exhaust for that.