1999 Sea-Doo GTX Limited Firing On One Cylinder

[bwburbank]

I have a 1999 GTX Limited that is only firing on one cylinder. I purchased the watercraft from my aunt and uncle and it had been sitting for a couple of years prior. I took it out soon after I bought it and tooled around for about an hour. It ran alright, but at wide open throttle it would die out. I thought nothing of it at the time because it had been sitting for so long.

I just took it out yesterday (been sitting for one month since last use) and it started really hard. It was running like a dog. I checked the temperature of both plugs to see if it was firing on both cylinders. The rear plug was cold. I replaced the plug with a fresh one and still no fire. I took it back to my house and checked for spark. There is spark at both plugs.

While running on one cylinder, at times, it would pick up and run on both. This would happen for a very short time (just enought to get me excited). From what I have read and problem shot already, I see it being a fule problem. I checked and it does have the older grey fuel lines.

Could someone please point me in the right direction. I should replace the fuel lines and clean the carb and intake valves, right? Please advise I am handy mechanically, but there isn't a lot of room in there and that intake looks like a pain to remove.

Thanks in advance,

Brian

 

[bwburbank]

Forgot to mention. The last time the watercraft was serviced compressions both checked out fine. It has the 951CC (might not be exact size, but it is the larger of the two enignes) engine. It has a brand new battery also. I know these crafts have "limp modes" but not exactly sure what puts them into that mode.

Thanks again,

Brian

 

[LouDoo]

It sounds exactly what mine was doing earlier this year, it turned out to be the voltage regulator/rectifier. Disconnect the red wire from the rectifier and see if that fixes it. If it does replace the rectifier.

Lou

 

[riding high]

Since your machine has the grey fuel lines , I would not run it another second without changing all the lines, cleaning the carbs, the fuel filter and the fuel selector valve. I have not worked on a 99 but I just got thru doing a top end on a 787 and it ain't no fun. If you have spark then you obviously have a fuel delivery problem. If you have a carb that is not delivering fuel then chances are it is not delivering proper lubrication to the cylinder. Have you read the compression? If not it may not be a bad idea to do so.

 

[LouDoo]

Yes riding high is correct you do need to change out the grey fuel lines, etc, and it is very important not to run your engine with a possible lean condition but please don't overlook the rectifier.

Lou

 

[riding high]

Lou will always give you great advice, he has a far greater wealth of knowledge about these machines than I do.

 

[cd24747]

Where is the rectifier? What does it look like? I'm having a similar problem.

 

[LouDoo]

The rectifier is located in the front electrical box.

Lou

 

[cd24747]

Just pull the red wire? I must appoligize. I probably sound like a clueless idiot but where is the front electrical box?

 

[SabrToothSqrl]

The 1999 GTX LTD is a carb ski. No limp mode, no rectifier.

The rear electrical box contains the coils that control the spark.

 

[cd24747]

Mine is a 2002 GTX DI. Sorry if I didn't clarify. Does it have a rectifier?

 

[SabrToothSqrl]

This thread's title is 1999 GTX Limited and hard to follow, if that isn't your ski, I suggest you make a new thread for clarity.

 

[cd24747]

After I posted on this I did. Mind taking a look?

http://www.seadooforum.com/showthre...running-rough-2002-gtx-di&p=282927#post282927