Very Confused with our 97 STX 900 - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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post #1 of 12 (permalink) Old 01-05-2017, 02:36 PM Thread Starter
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Very Confused with our 97 STX 900

Happy New Year to all...

Here's the current status on or 97 STX 900

going Right in the water it runs at 80% for a few mins, then 100% for a few, and back to 80% for a few mins. After about 10 mins like that it starts to rapidly die a slow death and stalls out. Takes a few tries to get it started then it repeats all over again.

It does this on both reserve and normal tank selections, has a new fuel filter....

Thank You as always for any and all help
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post #2 of 12 (permalink) Old 01-05-2017, 05:10 PM
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I know you went to premix. Can't remember if you kitted the carbs., and what were the results of a compression test ?
What do the plugs look like ?
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post #3 of 12 (permalink) Old 01-05-2017, 05:24 PM Thread Starter
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Hello Again...

I never switched over to Pre-Mix, I replaced all the oil lines and put new clamps on every end to prevent them coming off. When I hit the throttle oil enters all three carbs evenly.

Plugs all burn evenly. I have not done the carbs yet, leaving that as the last resort. Changed fuel filter with a generic one, and has a 1" Diameter. Not sure if that is too small? Also replaced the temp sensor and cleaned all the water lines, so there's no obstructions. Water flow is consistent with the rpm's.

When its at 100% it's tough to hang on, but i just cant keep it running on the water at 100%

Ordered a compression gauge today...
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post #4 of 12 (permalink) Old 01-05-2017, 05:29 PM
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I think you should kit the carbs. Does it act like it's loading up real bad ?
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post #5 of 12 (permalink) Old 01-05-2017, 05:37 PM Thread Starter
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Not sure what you mean by loading up?
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post #6 of 12 (permalink) Old 01-05-2017, 05:53 PM
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Getting to much fuel, then when the rpm gets high enough it takes off like a striped ass ape, but always runs like crap just off idle until almost very top end, say top 1500 rpm.
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post #7 of 12 (permalink) Old 01-05-2017, 06:05 PM Thread Starter
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Actually when I first put it in the water it runs good, but keeps going back and forth form 80% to 100% then back to 80% power, for about 10-12 mins then it starts to run at like 50% for a bit, then stalls. When it first goes in the water it feels like it wants to go full out but is getting held back by something.
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post #8 of 12 (permalink) Old 01-05-2017, 06:28 PM
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Probably going to find a bunch of crap in the carbs, maybe even some gummy substance. Sounds like you will be able to get away with out separating the carbs to pull the mixture screws. There are 3 or 4 different kits out there for the cdkII carbs. The real cheap ones will have a mesh material for the fuel pump and pulse diaphragms. That material will work ok on the liquid side, but will NOT work for the pulse side. It will not pull a vacuum. The two mid range kits will have a solid material like the oem for the pulse side, and then you have genuine Kiehin at the top of the range, and you pay good money for those. A cheap kit is about 25, mid range will be 30-50, and Kiehin is 50+. This is per carb.
You will need to pull the carbs all the way down, and pull and clean the intake screens. Be careful and don't bend the needle arms. I would also get a pressure checker and test the pop off, and make sure the regulator diaphragm goes back in the same way it came out.
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post #9 of 12 (permalink) Old 01-05-2017, 06:35 PM Thread Starter
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Thank You for the Great Advice, going to challenge myself and set some time to do it with good quality kits, ski is definitely worth investing in!
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post #10 of 12 (permalink) Old 01-05-2017, 06:40 PM
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They really are simple carbs. They're basically just a overgrown yard trimmer carb. You'll prob. need a couple cans of carb cleaner.
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