1999 760 Waverunner problem - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
 
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post #1 of 9 (permalink) Old 07-20-2019, 03:57 PM Thread Starter
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1999 760 Waverunner problem

I am having trouble getting my jet ski up to speed on start up. It runs about 15mph and stumbles for a couple of minutes and then gets to 35mph. It use to go 47 mph. Any ideas.
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post #2 of 9 (permalink) Old 07-20-2019, 06:19 PM
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Stumbles as in engine performance or engine revs and impeller feels like it's slipping ?
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post #3 of 9 (permalink) Old 07-22-2019, 11:43 AM Thread Starter
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I am having trouble replying, so here it goes again. I am not sure of the engine performance
or revs. The problem seems to be a carb problem in that it stumbles when I open the throttle
where it wants to die like it is getting too much air and not enough gas. What I can't under
stand is why this problem goes away after about two minutes. Don't this propeller slippage.
Any thoughts? Oh, I did rebuild the carb late last year. Dave
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post #4 of 9 (permalink) Old 07-23-2019, 05:48 AM
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If it was running fine last year, prob just needs the carb cleaned.
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post #5 of 9 (permalink) Old 07-23-2019, 08:30 AM Thread Starter
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This might sound elementary, but is the best way to clean the carb. Thanks
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post #6 of 9 (permalink) Old 07-24-2019, 04:13 AM
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Best way is to get a kit, strip it all the way down and clean everything with carb cleaner, blow dry with compressed air and make sure all the little orifaces are clear, reassemble using the old needle and spring.
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post #7 of 9 (permalink) Old 07-24-2019, 11:36 AM Thread Starter
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Thanks for your info which I assume means a carb rebuild. I will do that. However, while I wait for a kit, I am concern about your info on the possibility of the impeller slipping. It there a way to rule that in or out? Thanks
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post #8 of 9 (permalink) Old 07-25-2019, 05:04 AM
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If it was cavitation you would know it. Would feel like a slipping clutch. Only way to check it is with a feeler gauge to check impeller to wear ring clearance. If your not going to pull the pump, you might be able to pull the intake grate and reach in that way.
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post #9 of 9 (permalink) Old 07-26-2019, 07:49 AM Thread Starter
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Thanks for you info/help. Dave
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