Question about 1990 kawasaki ZXR 750

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Jet Ski Won't Start when Engine is cold

I have 2 1999 Kawasaki Jet Ski 1100 STX. Both of them have the same problem. They will continuously crank and not fire up. I think its a fuel problem because i did not put stabilizer in before the winter. I cleaned out the lines and pump thing on the rear of the engine, and took out the diapram and cleaned it. If i take the cover off the 3 carbs and spray some gas I can get it to start and run fine. It will start again no problem but as soon as the engine goes cold, it won't start and I have to take the carb cover off and put more gas in. That obviously isn't a permanant solution. Any suggestions?

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  • Greg Loenen
    Greg Loenen May 27, 2009

    I did take the carbs apart and completely cleaned them. I put it back together and it started up and ran fine. I went to take it out a week later, and it wouldn't start again. I had a half tank and filled it with high octane. Do you think the bad gas re jelled in only a week or is there another problem? Thanks


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Get a primer kit, considering these are not fuel injected you must prime some gas in it just as you would older lawn mowers and weed eaters... once the tank pressurizes you never have a problem. you may have a small pressure leak but common for older jet ski's.

30.00 fix and you will never have a problem again.

Posted on Jul 27, 2009

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You must take out completely the carbs and clean them especially their canisters with the flowters.They may have jelled gas inside or closed air pipes.Use a carb cleaner spray and compressed air.

Posted on May 26, 2009

  • MakisRC51
    MakisRC51 May 27, 2009

    If you haven't started the engine for some time:Empty the carb's canisters, turn on the gas and use a bit of carb cleaner spray injecting it from the air box towards the carbs while cranking the engine.The choke cable (if there is one) should be pulled out all the way and NO throttle at all.Just crank it and spray little bit at a time.
    Are we talking for a 4 stroke or 2 stroke engine?
    While it is shut off does the pump isolates the gas from the carbs or it let the gas drip a little day by day.


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