Polaris Jet Ski Engine Running Issue

[AC2717]

Still no luck but there was a revalation:
Clean fuel filter, clean carbs, throttle working correctly, gas seems to be a non issue (meaning it is not bad)
dash unit not the problem - disconnected it off and ran the same with it on or off
here is what is happening now:
runs almost like in limp mood, when you hit a wake and the machine either gets bumped by the wake or tilts up into the wake (as in comes out of the water a little and has less resistance maybe, or maybe something it sticking and the bump knocks it loose for a little bit), she takes off up to full speed, then eventually slows herself back to the slower speed, or if going good and start to make a turn the same things happens. I though it was tugging the wires in the dash unit, so i look at that, and there was no movement there

at this point I am thinking the ECM might has an issue, but I have not been able to find locate the water bowl on the machine to check this, as tilting up may make room for more gas flow and then turning shifts something around in there. Does anyone know where it is - is it the part that the fuel line runs into after the filter and gets separated into three lines to go into each carburator, I doubt it but I cannot see anything else.

Also I checked all wiring connections all are good and tight, engine also only about 7 years old-but was an exact replacement to the original.

I am going to get back on it, the end of this on the water bowl, before I hand it over to H&K, does anyone else have any ideas?

[codeman671]

Originally Posted by AC2717

Still no luck but there was a revalation:
Clean fuel filter, clean carbs, throttle working correctly, gas seems to be a non issue (meaning it is not bad)
dash unit not the problem - disconnected it off and ran the same with it on or off
here is what is happening now:
runs almost like in limp mood, when you hit a wake and the machine either gets bumped by the wake or tilts up into the wake (as in comes out of the water a little and has less resistance maybe, or maybe something it sticking and the bump knocks it loose for a little bit), she takes off up to full speed, then eventually slows herself back to the slower speed, or if going good and start to make a turn the same things happens. I though it was tugging the wires in the dash unit, so i look at that, and there was no movement there

at this point I am thinking the ECM might has an issue, but I have not been able to find locate the water bowl on the machine to check this, as tilting up may make room for more gas flow and then turning shifts something around in there. Does anyone know where it is - is it the part that the fuel line runs into after the filter and gets separated into three lines to go into each carburator, I doubt it but I cannot see anything else.

Also I check all wiring connections all are good and tight, engine also only about 7 years old-but was an exact replacement to the original.

I am going to get back on it, the end of this on the water bowl, before I hand it over to H&K, does anyone else have any ideas?

My recommendation at this point would be to pass it off to a dealer, although my advise would be to use Rochester Sports Center on route 125. Its a bit further out, but Carl and crew are excellent with these.

[AC2717]

c'mon someone has got to have ideas here.
This is the Winni Forum, there is always answers!!!!

[codeman671]

Originally Posted by AC2717

c'mon someone has got to have ideas here.
This is the Winni Forum, there is always answers!!!!

ECM's are not cheap, and not returnable. If you think it is electrical such as ECM, I would let the dealer mess with it. If they mis-diagnose it, they own the part.

[jmen24]

Given the last situation you mentioned, my thought is one of the floats is bad. When you hit the wake it would move the float into the correct position.

With a multi carb setup, having one carb not working correctly will allow the engine to run, but it will be running down a cylinder and will be very noticable. Low rpm will seem somewhat normal (there are tell tale signs of a cylinder not firing but it has to be heard and you need to know what to listen for, most folks just hear noise when listening to an engine run), but when you increase the throttle the bad cylinder will increasingly drag on the other two. This prevents the total package from optimizing and running out to higher rpm.

A question for those familar with this engine. Are the floats on these rubber or brass?

To test a bad float: Remove the float pin hinge and submerge in gasoline, look for bubbles. If no bubbles, release and see if it floats. If it passes both those test, pick it up and shake it next to your ear, there should be no sound at all (hold the pine hinge when doing this).

Either way I would not run this unit for prolonged periods, if it is a cylinder not firing, that puts a lot of pressure on the crank and will wear out the bearings next to that rod.

I would be very surprised if it was electrical related, given the last situation you presented. That would be a one in a million shot that two very different events (wake and turning) would recreate a lost connection.

[AC2717]

jmen seems reasonable to be that, I did not even think about that. if that is the case, I am not touching it, carbs are not my things especially with three sync with each other

[NHBUOY]

ttt ... ...

[AC2717]

I am so sorry I forgot to post the results.

SO it turns out that one of the Piston heads developed a small pin hole in it.
Had a new head put on it, running like a champ now