98 GTX Limits fuel issues

[AKJetSki]

Hello, new here, introduced myself in the other topic.

Trying to troubleshoot a fuel problem with this GTX. This is a friends machine that he is letting me use if I can get it running.


Here is what I know-

Ski was running fine but low voltage warning was going off.
Running started getting progressively worse, ar first it would be hard to start after some use.
Plugs seemed to be fouling but they didn't look bad but new plugs would make it easier to start after warm
Top speed was about 56mph then dropped to 40 something and bogging at start-off.
Then it wouldn't start at all so it got left with me to fix.
Pulled the carbs and checked them over. Didn't see anything too bad. Put them back in.
Can get it to run by pumping throttle which I assume is the accelerator pump functioning.
Fuel filter located in front by selector valve does not fill up while cranking engine over.
Pulled selector valve and could pass air through all ports.
Have card kit and needles and seats coming. I suspect maybe the fuel pump diaphragm is bad.
I can feel air at pulse pump hose when I pull it.
Still has the grey fuel line, could there be a clog and still get fuel to the accelerator pump and not the fuel pump?

Also while pulling the carbs noticed that the cable to the oil pump was broke, does that leave it in and open position and gets full oil all the time? Could be the plug fouling issue. Didn't think of this before. Mixed the gas so possibly will run rich for this tank.

Search has been good but thought I'd lay it out and see what you guys have to say.

Thanks ahead of time.

Sean

 

[mikidymac]

Grey fuel lines will be the death of that engine. Replace them before moving forward.

You need to replace the fuel strainer and fuel selector as they can't be cleaned and WILL leak air.

Replace the oil cable as it goes wide open when broken and that with pre mix will be way too much oil and foul plugs.

I hope you ordered only OEM Mikuni carb kits and needle and seats.

 

[Triorieel]

replace grey fuel lines...they will just create problems. I'm sure you have probably already seen the greyish soot in the filters.
Fuel selector could be clogged or letting air in. fuel filter could be letting air in.

You can try bypassing everything temporarily for testing. Going straight from the fuel tank to the carbs.

 

[AKJetSki]

Alright looks like I am going to have to do the fuel lines, Looks like 25' of 1/4" fuel hose and 20 ss clamps.

I had the selector valve off and it wasn't clogged but I hadn't read about it leaking air, guess I'll order one of those. Same with the fuel filter.

I did end up ordering an aftermarket kit and I had read the warning to use only Mikuni but shipping to Alaska isn't always the easiest so if I want it quick I gotta find the right seller. We'll see how it goes.

Thanks for the replies, I'll keep this updated with progress.