A strange new problem with the 94 xp :(

[sergeantmay]

Hello all!

I recently had some carb issues with my 94 xp which i believe i have now sorted but now im facing another problem, basicly it will run flawlessly for a good 45mins with no issue atall, well not that im aware of, then it will change engine tone and just bog badly and sit around 2000rpm with WOT and then about 30secs later just die and wont start, with or without choke ect it just wont start, it doesnt even try to start kinda like its totaly dry of fuel.. it seems its getting plenty of fuel to the carbs though, weird thing is the engine note when this happens.. it sounds alot deeper and seems to vibrate the ski somewhat, im thinking this maybe electrical? or a water blockage? its like it warms up then dies and doesnt want to know after that, ive done the research but im out of ideas as i havent come across anything simular to whats happening to my ski

It will start and run fine out of the water after i get it going, takes alot to start but once started its fine, has anyone had any simular issues?

Any help much appreciated!

Thanks all :seeya:

 

[Dr Honda]

Sounds like it could be electrical... but it VERY bad to hold the throttle open for 30 seconds when it's only at 2000 rpm. If it is a fuel issue... you just starved the engine of OIL for that time... and running lean, which can melt a piston crown.


OK... before we get too deep... I would check the compression. After that... cut back the sparkplug wires a bit. They can corrode right behind the boot. So... pull the boot... cut about 1/4" off... and put the boot back on.

 

[sergeantmay]

Thanks for your reply Dr!

Oh dear! thats something i did not know!! thanks for the info i wont be doing that again, hopefully i did not do any damage, i did check the compression when i got it home and it was 138 and 140 which is what its always been, i will cut back the leads later on.. thanks Dr

 

[RodInEscondido]

Sure sounds like the symptoms seen when the fuel tank vent is clogged/inop.

Better to find out before going on the water again, but if it happens again loosen the gas cap and see if it sucks air in.

Rod

 

[470]

I doubt he did any damage. If the throttle is held wide open so is the oil injection pump. If he's only pulling 2000 rpm he's not even getting on the mains and actually going rich on oil or in a sense lean just like adding breaking oil to your fuel tank.I agree on the plug wires/comp check and would look at the VR also.

 

[sergeantmay]

Thanks for the replys guys!

Funny you should say that as the only line in the fuel system i havent replaced is the vent line, although does appear to not be blocked, i did check when i got it out of the water the pressure buildup in the tank and there was pressure there just a shame i did not think of what you said when it was in the water, next time i get out on the water il deffo try that and see the outcome

So how would one go about checking the vr? im guessing you mean voltage regulator? ive heard these can go bad and to test unplug the red wire but im not realy sure how thats going to help me determin if thats the problem as once the issue occurs thats it its a no go so unable to fully test that idea if that makes sence

Does anyone know of any common problems with the 94s when thay warm up? i read somewhere about a faulty temp sensor, could this cause it to do this?

Thanks all!

 

[470]

Check your PM. I have 2 94 xp's and they have been bullet proof. I actually like them better then my 95's with the 717's. I did lose a VR last year on one. The mid range would stumbled like yours though it can be other simple things to check first. One even has the old tempo lines on it and there perfect but I don't run ethanol fuels either.

 

[RodInEscondido]

Thanks for the replys guys!

Funny you should say that as the only line in the fuel system i havent replaced is the vent line, although does appear to not be blocked, i did check when i got it out of the water the pressure buildup in the tank and there was pressure there just a shame i did not think of what you said when it was in the water, next time i get out on the water il deffo try that and see the outcome

So how would one go about checking the vr? im guessing you mean voltage regulator? ive heard these can go bad and to test unplug the red wire but im not realy sure how thats going to help me determin if thats the problem as once the issue occurs thats it its a no go so unable to fully test that idea if that makes sence

Does anyone know of any common problems with the 94s when thay warm up? i read somewhere about a faulty temp sensor, could this cause it to do this?

Thanks all!

But was it pressure or vacuum in the tank? Big difference. Not to start or steal your thread, but did it suck or blow? bigjake or loudoo are not allowed to reply.

Good luck.

Rod

 

[sergeantmay]

Ok so ive done the leads, cut about 1/4" off one did look rather green/brown in colour, i also decided id check the pressure valve thingys for the fuel system and the black one seems to be blocked but the other clear/white one seems to be ok, it lets air in/down but not out/up, ive only blown through the black one but no air comes out in either direction, the black one is the one that comes out the side of the ski which i assume lets air out of the tank but not back in? im guessing this is my problem, can i run the ski in the water without the black valve on to test if i get any issues? or does it need the valve there for the pressure in the system?

I started the ski and as always it ran fine on the trailer so im dieing to take it out and see what the situation is now

470... thanks for the pm

Rod... im pretty sure its pressure, i started her up and ran for 30secs and there was pressure built up in the tank after, it does sound like air coming out of the tank more so then air going into the tank like a vacuum

Thanks for all your help so far!