2002 GTI - runs fine for 10 mins then sputters / surges but wont go high rmp

[rmwilson]

My neighbor knows I am super handy with 2 strokes - and asked me to look at his 2002/2004 gtI seaDoos, The symptoms he said was runs fine for 10-15 mins then surges or does not rev out - he of course is not technical at all I tried to ascertain if it was fuel surging or like overheating and hitting safe mode or rev limiter i.e maybe over heating.

Going down the over heating path - I started to look at all cooling lines as to me sounded like it might be overheating then going into a safe mode (I am not sure if they can go into an over heat mode can they? (I know my 1990 yamaha waverunner could go into a over heat mode and limit rpms) - disconnected them ALL (exhaust, head, pump intake, exit etc) and blew air through them freely, pulled head off and really nice and clean I was hoping or expecting to see weeds or sand in there no such luck. Can the venturi bilge pumps get clogged up or cause any problems in cooling system lines? (Vacuum or blockage????)

I checked temp sensor - it has continuity but an open no resistance reading when at ambient temperature - I did try to warm sensor with a heat gun I heard it click.

I have scoured the internet found one guy saying rubber grommets (top hat shaped seals/ rubber bushings) (at the back of the machine where the pump connect to the haul) in the pump housing can collapse when warm restricting water flow - any way to test or verify this? (other than pulling out pump/jet and seeing how soft they maybe?)

can a fuel line start to collapse after they warm up? Or

What would electrical symptoms be on these machine - bad cdi bad rectifier,

Can any one give me any ideas and what to look for on how to trouble shoot these machines ( neighbor claims carbs were rebuilt by a shop and that did not fix the problem)

 

[mikidymac]

There’s no overheat mode it’s just an idiot light, nothing more.

Try opening the gas cap and see if that fixes it. When the check valve goes bad they create a vacuum after a few minutes and can starve fuel.

 

[rmwilson]

There’s no overheat mode it’s just an idiot light, nothing more.

Try opening the gas cap and see if that fixes it. When the check valve goes bad they create a vacuum after a few minutes and can starve fuel.

Interesting ... thanks for that. I will look into it certainly a valid idea and helpful response -

 

[burtshaver2021]

Check the gap between wear ring and impeller, to large of a gap can cause over heating issues, although the performance would be noticeably poor. Also, the shop the rebuilt the carb, was it a shop know to work on 2 stroke seadoo’s? I find a lot of marine mechanics and auto mechanics that are not familiar with them will put the cheapest rebuild kit in the carbs they can find, and that can cause issues.

 

[rmwilson]

Check the gap between wear ring and impeller, to large of a gap can cause over heating issues, although the performance would be noticeably poor. Also, the shop the rebuilt the carb, was it a shop know to work on 2 stroke seadoo’s? I find a lot of marine mechanics and auto mechanics that are not familiar with them will put the cheapest rebuild kit in the carbs they can find, and that can cause issues.

Something I'll certainly check ... 9 I was going to check carb pop off pressure ... at this stage not having ridden them I am guessing and and assuming it over heatimg ... ( there are two I started work on pne I may just take the other one out and get an actual feel what's happening) - thanks Burtshaver2021