Super Jet Please help guys! Rn issues been chasing a year now...

[sjetrider]

Sure does not sound like a reed problem, if it were it would run like crap down low but good mid to top.
2 things come to mind once you stated it does not happen on the trailer. Stator is one and fuel pump is another and this is only assuming you have a good coil and CDI.
If the filter stays full then its most likeley not your preasure valve or a leaking line anywhere (CHECK THE PULSE LINES VERY CLOSE).
If it only happens on landing or something like that then check your exhaust system (especially the waterbox for loose parts).
first pulse line, remove it / them and inspect fully.
then stator, remove it and ohm test all wires while wiggling each one to check for breaks in wires
waterbox remove and shake dont stir
fuel pumps, remove and inspect fully and have a rebuild kit handy
Make sure your PRIMER LINE is in the return fuel line not the feeder line, they can cause vaccum and cause this very issue. also check them for cracks and pinholes.
Check the incoming fuel line for slight blockage, shoot air through them from the carb side back towards tank.
hope something here gets ya going.


I went through a frusteratingly painful issue like this before , changed EVERYTHING, then one day Toby says check your waterbox and BAM $1500 in new un needed parts later I had a busted baffle in the WB clogging the exhoust but only when in the water and playing on it, NEVER ON TRLR EVEN UNDER A LOAD. drove me nuts for 2 mos. ended up with lots of good spare parts in the end though.

 

[cattledog]

could be a bad primer remove or plug up the small primer lines if it is sucking in air

 

[Hollywood Hood]

Well guys tons of good info! Lets just say keep it simple I feel like a total dumbass! I was pulling the tank out to pull flywheel and check seals etc etc then I'm looking at the inline fuel filters going hmmmm thinking to myself I replaced those already and there is fuel flowing through the lines at all times I said what the hell and blew through them and holy they were defective! They would look like they were flowing fuel even at him rpm when really they weren't I could t believe it! Took them off ran straight from tank to carbs and wow she hits like a freight train! Lesson learned check! Double check ! And triple check! Lol! 1000$ in parts later got a lot of spare stuff thanks again guys!

 

[sxipro02]

Awesome!! Sjetrider, Thanks for your info, I will be moving my primer to the return side.

 

[Vumad]

My ski always acted up when it 1st started. It would not want to get going until it had idled for 30 seconds up to about 2 minutes. If I gave it gas, it would either sputter and not go, or more commonly fall on it's face and die. I haven't fixed it because I was going to be taking everything apart except the short block after Daytona for all the Maniac parts I just got.

It took some abuse in Daytona, and now it's displaying a lot of similar symptoms to what you describe. I hope it's an easy fix like a fuel line or a dirty carb. I haven't had time to look at it yet. It sputtered a few times in Daytona but really went south at the lake the other day. Idles fine. Runs WOT fine. But in b/t idle and WOT is a mess.

 

[JGringo]

leak-down test?

x2

 

[jetpilot08]

A leak down test and if you have a multimeter I would check your stator...or if you want to spend some money send it to JSS. John does excellent work and it will be bullet proof. There are many on here that can vouch for the work he does.

I think there is a link in the tech section to the superjet manual. It will tell what the specs should be for your stator.

EDIT: heres the link to the various manuals.......http://www.x-h2o.com/threads/74013-...s-Guides-%96-Wiring-Diagrams-%96-Software-etc

 

[CarterB]

ive run the $3 cheapo fuel filters from like ADVANCE and have had the same problem before. They seem to be made more for very low fuel consuming motors like lawn equipment. Also they come apart and will clog up your carbs internal filters as well. Oh and ive seen people run vinyl lines into their tank pickup that have softened from race fuel or maybe even regular fuel and collapse on their self at high rpm -only under load too.