Super Jet Superjet hard to start after stalling, out of ideas..Please help.

Hi I has a similar post in the freeride/surf section but thought I would see if I got more response here.

I am having a problem with getting my 02 SJ to start after stalling or falling off. If I prime it 3 times after it stalls it will start 70% of the time right away, but I dont think I should have to do that. But the other 30% of the time it takes more more priming and a lot more tires before it will fire. This is becoming a problem because Im not real confident that if a crash trying a re entry or a barrel roll that the thing will start again before the next wave comes by. It seems to run pretty good which is why its hard to figure out what is going on. The only thing is if you hold it steady for awhile at about 1/8th throttle it seems to run just a little rough, but as long as your on and off the throttle you would never notice that.

It has about 165psi in each cyliner with a stock head, it has carbon tech reeds and a b pipe all else is stock. Ski has had this problem since I started riding it in the surf even when the pipe, reeds, and jetting were all stock.

Jets are 142 main, 72 pilot, 95g pop off, all else stock. screws are high 2 3/4 front and 2 1/4 rear Lows 2 both front and rear. the rear does run a little richer then the front, I figured because with the stock head it is prolly running a little hotter?

I have not heard of people really needing to run a 142 main but its not running to rich with it.... which could maybe help someone determine what is wrong with it since it is needing a rather large jet?

I dont think its sucking up water because even if it flips over and I hit the bilge after very little water comes out, and its not like I have to "blow" the motor out after this happens, it will run just fine once it fires.

Does not seem to have electrical problems but its hard to say. I just put new plug boots on and that didnt help. Also the gas tank is holding pressure.

Im really out of ideas here.. if anyone has any ideas I would appreaciate the input.

Thanks
 

rubbertoe

X-H20 certified
Location
San Diego
Well to me it sounds like an water ingestion issue .are you running stock a/f because it doesn't take a lot of water to give you a problem (a little water in the right spot is all it takes).maybe start by emptying your tank and siphon out every last bit in the tank and start with some fresh fuel and see if that helps.also maybe try running the stock a/f set up if you aren't running it.it sounds like what your describing is a boat that's cleaning out.you deffinately shouldn't be priming a boat that has been warmed up.hope this helps you
 
I am running the stock air intake system. Unless it flips over and I loose it and it takes me a bit to get to it I dont think it takes on much water at all.even if I run the bilge nothing really comes out and like I said once it fires it is good to go. There have been times I know i ingested water and you need to "clean" out the motor before it will run normal again but this isnt the case 95% of the time. Even if I shut the motor off intentionally and I am 100% sure it has not ingested water it still needs priming to get it going most of the time.

Assuming it is not water ingestion, if the fuel pump was not working 100% could that cause the issue? I was thinking it has prolly never been rebuilt and it is a 2002. I have cleaned out the side with jets but never touched the fuel pump. I also thought that might explain why I am running a much larger (142) main when most people run 135s for a similar setup.

Any logic to my thinking?
 
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Front is leaner than rear but looks good, nice and brown rear is a little rich and the rear high speed screw is in half a turn more than front screw.
 

FlightPlanDan

Don'tTrustAfartAfter50
Start simple. Check all fuel lines & connections. Especially at the on/off/res, if it's still there. Air gets in, lines empty out and you prime all the time.
Just a thought.
 
I already took that off and just run one line from the reserve directly to the carb. Appreciate the thought though. It has to be something fairly simple the thing runs perfect in the mid to top end range, isnt too bad down low but I wouldnt call it spot on. I have to figure this out... its seriously driving me crazy... I just want to have confidence that this thing will start easily when I need it to.
 
Fuel filter clog?

10 years is a really long time...... might be time to go thru those carbs 100%.

I dont think the fuel filter is clogged it looked clean on the inside when I had it off. But I cant say for certain so I will check, whats the best way to check? Just blow through it?

In my mind it just seemed that it kind of makes sense that the fuel pump isnt working 100% because the thing always seems to want more fuel, like I said I have it jetted way richer than anyone else with similar setup.
 

rubbertoe

X-H20 certified
Location
San Diego
try going to factory pipe settings 135 main 70 pilot 2.0 needle &seat 95 g spring and turn your screws in to a little past 1 turn and see how it runs ,as a easy process of elimination.you could be running to rich.are you checking your plug readings under a load?(in the water)
 
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Here is the inside of my fuel pumps, dirty and one of the little filters was a third full with crud and the other filter was about 1/4 full with crud. I think this may have been my problem... I guess I need to do a complete rebuild. Then I will put the correct jets in and hopefully I will be good to go.
 

rubbertoe

X-H20 certified
Location
San Diego
are u kidding me ???? pic = un -braaapppage .your saying that your boat idled and ran ??? you had to be experiencing mad problems .not as described .lol
 
are u kidding me ???? pic = un -braaapppage .your saying that your boat idled and ran ??? you had to be experiencing mad problems .not as described .lol

haha I know right, it idled fine and ran pretty good except for that stalling problem, down low it wasnt spot on but mid and top seemed ok. Cant wait to get a rebuild kit and see what this thing feels like. It looks like I have found my problem though... I will have to follow up after I get it rebuilt but I think anyone could agree this could be causing my starting issues? haha
 
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