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Help troubleshooting 94 xp 657cc

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The pump is in the mag carb and has a diaphragm that is moved by the pulse of pressure from the crankcase and the check valves in the carbs. It could have been damaged when your buddy had the carbs apart cleaning them, to test the integrity of the pump diaphragm, you can apply 3psi to it, it should hold for 10 minutes. The pulse line should be the only line that runs from the carb to the crankcase, and it should be about 6 inches long.
 
great info strizzo, i kind of had a feeling thats how it worked but wasnt 100% sure. This things should just have a fuel pump like a car. Ok i will do that tomorrow, i will have to take the carbs off again right? to which hole do i apply the air pressure? Also quick question about the pulse line, is there gas supposed to go through it? yes i put a new line and it is actually a little over 6 inches long
 
marioseadoo said:
great info strizzo, i kind of had a feeling thats how it worked but wasnt 100% sure. This things should just have a fuel pump like a car. Ok i will do that tomorrow, i will have to take the carbs off again right? to which hole do i apply the air pressure? Also quick question about the pulse line, is there gas supposed to go through it? yes i put a new line and it is actually a little over 6 inches long
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There shouldn't be any fuel going through the pulse line, and yeah you'll want to pull the carbs again unfortunately.
 
Are you getting fuel to the carbs? If not you have to prime the fuel lines. I personaly use an air compresser, i open the gas cap,cup a rag around the air nozzle to seal the opening. I blow some air into the gas tank and hit the start button for 5 seconds. I reapeat that step about 5-6 times and it is primed. If you open the hood and take out the storage compartment, you can see the water,fuel seperator fill up.
 
Jetskigoodies said:
Are you getting fuel to the carbs? If not you have to prime the fuel lines. I personaly use an air compresser, i open the gas cap,cup a rag around the air nozzle to seal the opening. I blow some air into the gas tank and hit the start button for 5 seconds. I reapeat that step about 5-6 times and it is primed. If you open the hood and take out the storage compartment, you can see the water,fuel seperator fill up.
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If the fuel pump is working correctly, that is all unnecessary, it can self prime through completely dry fuel lines with no problem.
 
I have had to do that to the last 3 i changed all the fuel lines on. Maybe when i changed the filter in the seperator that made me lose prime? Not sure but i think i almost fried a starter trying to prime it just by starting it. I found its quick and easy and no worry about overheating the starter.
 
Strizzo is right about checking the check valves. I bought a 95 xp and the guy thought his motor was cooked. I got it home and noticed the carbs looked wrong. When someone redid the carbs they put the plate covering the pump on wrong, there is a ball pertruding that sits in a hole in the pump, it is there so you can reassamble it only one way. The guy put it on backwards tightened it down and that ball went right through the check valve. It actually dented the aluminum on the edge of the valve. I replaced the pump and she fired right up
 
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ok i found my problem, fuel delivery. What i did was get a clear fuel hose, plugged it to the carbs and the other end to a jerry can full of gas, i gave it a crank and it turned on right away, lots of thick smoke came out at first but then it was the normal smoke. only thing i notice after running for about 5 mins it wasnt iddleing good and then iddle was bad and it shut off, but i crank it again and started fine, im guessing i need to adjust the iddle. So its raining pretty bad now but tomorrow ill figure where are my fuel hoses letting air in
 
Ok i had the jetski running, took it out to the lake and it idle fine, throtle response was nice and smooth. So i seen that everything was fine i decided to gas it and go for a joy ride, well i was quite far away from the dock when all of a sudden it died. I couldnt think of anything so while i was figuring a way to get back to the dock or see if someone on a boat would help me out some time went by and i decided to crank it and it came on so i drove it slow cause it seemed hesitated when i try to give it gas. So im thinking two things is happening either overheating, or my brother says i might not be getting oil to the motor. Ive done some reading on here and i hear a lot of people with my type of jetski having to mix the oil with gas cause their oil pumps go out, could this be my problem or could it be overheating? Any help, comments are very much appreciated.
 
If it was overheating your beeper would have sounded, well that is if it works. The oil pumps are rock solid on seadoos, oil block off plates are not suggested with seadoos so no premix needed. If you had no oil your top end would be cooked and you wouldnt have started it back up. Did it bog down, before it died or just a hard stahl, simply died, how did it die. If it just shut off, i would check the grounds, and all your connections on the starter and battery. And i would also say carb issue again when its hesitant with giving it throttle. You could have an air leak. If i were you i would send those carbs to doc honda or minnetonka and have them rebuild your carbs, buy a new fuel selector and o ring for your water seperator. Just replace it all so you know its right
 
So why do i hear so many people on here saying they had to switch it to premix cause the oil pumps had died? My brother took it out this afternoon and he said it did the same thing that happened to me, he ran it hard for about 4-5mins then it suddenly died and he tells me he waited 2hrs and it did not want to start again, he also says his suspicion about the oil not going through is more obvious now cause when he was running it he didnt see much smoke or not at all. I dont know how quick is the oil supposed to go down but mine hasnt moved much and ive ran it a couple times
 
Its not your oil pump. I dont see any smoke coming from any of mine after the first minute of running. Actually it isnt even that long that it smokes. If their oil pumps die then the motor would be blown no oil= complete rebuild. even if you want to run premix that would not fix your problem. You may be flooding your motor. If you turned the wrong dials on the carbs that could be your problem too, have someone who is knowledgable with MIKUNI carbs rebuild them and dial them in. Since your first post on this it has been a carb issue. If whoever checked your carbs didnt do a pop off test then they didnt correctly check them, they may have cleaned them but they may need a complete rebuild. Everytime you say you do something with the fuel system it seems to get better. So do it right with a complete rebuild by someone who knows what they are doing, I did see you had them rebuilt, you may need needles and seats, the kits come with different springs so you can do a pop off test and determine what ones you need. the guy who did yours may have just used the ones that looked like the same length and didnt do the pop off test. Also if they took your carbs off the oil injection cable needs to be put back on correctly.
 
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Also with the over heating issue, if you are unsure if your cooling lines are plugged or your beeper doesnt work, first look at the back of your seadoo you will see a hole by your tow hook check and see if a stream of water is coming out of the peetell while you are giving it throttle. If not somewhere your lines are clogged or even your water jackets could be clogged. As for the beeper not working if you think your over heating just touch the head of your motor if its cool or warm its fine, there is a problem if it is too hot to touch.
 
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