(2) 01 GTX's not getting up to speed

[pjensen220]

Hi,
I have try searching the forum and couldn't find an answer to my question. here it is we have 2 2001 gtx's that have ran great the last 2 years we have owned them. this summer when we took them out on the water for the first time after winter they wont go past 35 miles an hour. it seems to take off great but when they do get to 35 mph it seems like only one cylinder is firing we took them to the shop that winterized them (a seadoo dealer and repair shop) and they could find nothing wrong. they tried reprogramming the keys which also had no affect. i have tried replacing the plugs but i am not sure what to try next. any advice is welcomed and thank you for reading my post.

 

[kustomkarl]

Re-programming the lanyard would have nothing to do with the performance of the seadoo. Which model 01 GTX do you have?GTX, GTX RFI, GTX DI? You should list it in your avatar for future problems/ questions. Use my avatar as an example.


Karl

 

[pjensen220]

i didnt really think that the reprogramming would help.they are just the plain gtx. i will also change my info so thats there
thanks

 

[obzezzed350]

maybe bad fuel?

 

[pjensen220]

They have brand new 91 octane gas so I don't think so

 

[bz1mcr]

I am working on a similiar problem. It is maazing how many complaints there are about dropping back to running on one cylinder when trying to go fast. So far no "solutions found". I'll be watching your thread and let you know if I learn anything useful anyplace else.
Don

 

[cdnbikerdude]

Have you changed the fuel lines and cleaned the carbs / filters?

 

[bz1mcr]

Fix for high speed missing one cylinder

I have not tried this but it has been suggested that it could be a failed rectifier. If so there is an easy test. Just disconnect the red wire, which will disable the battery charging circuit, if the miss goes away the rectifier needs to be replaced. You the machine will start and run ok with the lead off, but the battery will slowly discharge. It should be fine for a test ride of up to 1/2 hr. But, don't leave it disconnected, eventually the battery will go low and ignition and cranking will be disabled.

It's an easy test and fix if that's the problem.

Let us know.
Don

 

[bz1mcr]

For the record: It did not solve my problem. I guess my rectifier is ok.

 

[hectechnology]

Have you tried changing the spark plugs?

 

[kustomkarl]

I'm not sure if the servicing dealer did this, but did you do a compression test yet to see what the internals of the engine are doing? Low compression would do this. Here is some information on a compression test;
You'll need a compression tester. Go to Auto Zone. I think they sell for like $25.00. The compression gage, will screw in the cylinder head in place of the spark plugs. To test compression, remove both spark plugs. Place spark plug caps on the plug cap studs near the cylinder head to ground the empty caps. This completes the circuit of the ignition electrical system and prevents any electrical problems from the caps being un grounded. Using the correct adapter for the threaded end of the tester,( same length of the spark plug threads length)screw in the tester in one plug hole. Hold the throttle wide open. Push the start button. Watch the compression guage, when it peaks out at the most compression, let go the start button. Read the psi number. I would do it 3 times to be sure it is accurate. Check both cylinders the same way. The ideal compression is 150 psi per cylinder. If it is less, it's not a problem as long as they are close to being the same. If the psi is less than 90 it might need be time for a tear down and a rebuild. If the psi in 1 cylinder is say 140 psi and the other is 80 psi you need to tear down and repair. This difference is a lot then there is a problem. I hope this helps you.



Karl

 

[derek]

other possibility is gummed up RAVE valves, unless these are 717 engines, which i doubt.