JS550 Carb Help

Rusty2 · Jan 17, 2016

hey everyone I'm pretty new to the stand up skis and i have a js440 and a js550, the 440 runs but the 550 does not. it use to have a little life but not really so i rebuilt the carb and now nothing, if i pour gas down the intake fires right up. i know i could upgrade it to a sbn carb but I'm not trying to go that route just yet. it has a pulse coming from the case it has the rev limiter deleted with a restriction in the return line, iv taken the carb apart a bunch of times to see many i put something in wrong but when i look at the diagram it looks just right, i have the fuel in coming in the front, the pulse line on the right side of the carb (bow side) and the return on the left side of the carb. i can not figure out why it will not pump fuel or do anything with the fuel.... I'm stumped

Patrickx2 · Jan 17, 2016

I'll try and help you.there not the best carb first blow down the pump on the carb with your mouth.you shouldn't be able blow if you can its knackered.

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Patrickx2 · Jan 17, 2016

Is it piston port or reeds?the black engine is piston port silver engine has reeds

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chadman154 · Jan 17, 2016

i had the same issue, check your fuel filter

Rusty2 · Jan 17, 2016

its piston port no reeds, and ill do that ill try blowing into the pump and see if its bad, the fuel filter has been replaced with a in-line.

Js550FTW · Jan 17, 2016

Will the thing kick at all or does it just sit there while you crank away

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Rusty2 · Jan 17, 2016

just sits there and cranks. it will start right up if i just pour some fuel down the intake

Js550FTW · Jan 17, 2016

Will it Stay running when you prime it

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Rusty2 · Jan 18, 2016

not by itself if i keep dripping gas in no problem as soon i stop dripping gas in it will shut right down

Js550FTW · Jan 18, 2016

Well from what it sounds like it seems the problem is the carbs not getting gas. Check fuel line pressure that might be the problem

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Rusty2 · Jan 18, 2016

thats what im trying to figure out why it wont pump fuel even after rebuilding everything

Patrickx2 · Jan 19, 2016

what I'd do is swap it for a new carb those carbs are a nightmare to work on.super jet Single carbs will fit straight on

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Rusty2 · Jan 19, 2016

i did not know that ill search ebay for a super jet carb and maby go that route then with both the 440 and the 550, you could do the sbn44 also right?

Js550FTW · Jan 19, 2016

Rusty2 said:
i did not know that ill search ebay for a super jet carb and maby go that route then with both the 440 and the 550, you could do the sbn44 also right?

Yes sbn44s will bolt right on. I think you need a spacer between the port and mani thought so it fits

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Patrickx2 · Jan 19, 2016

Don't go to big with the carbs 44 will be ok.you mite have to change the jets it's not a biggie

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Js550FTW · Jan 19, 2016

Patrickx2 said:
Don't go to big with the carbs 44 will be ok.you mite have to change the jets it's not a biggie

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Just wondering what would happen if you put something like a blackjack 48 on it

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Patrickx2 · Jan 19, 2016

I'll have a look at bro ski in the morning to see what size carb I fitted to his old 550.hope this helps the more you fiddle about trying different things the easier it gets.its all trail and Error

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Rusty2 · Jan 19, 2016

sweet well before i go swapping carbs im going to try and blow into the pump and see if its crack or anything since the 550 is owned by my buddy and im trying to get it to run for him, and i rather put money into my 440 to give it more power maby 550 swap it in the future

Patrickx2 · Jan 19, 2016

I'll take some pic in the morning I'm in the middle of modifying a 550 hull and fitting a zxi750.the customer really wants to do a flat water backflip

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Rusty2 · Jan 19, 2016

Patrickx2 said:
I'll have a look at bro ski in the morning to see what size carb I fitted to his old 550.hope this helps the more you fiddle about trying different things the easier it gets.its all trail and Error

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awesome thanks dude that will be awesome

JS550 Carb Help

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