2001 Yamaha Waverunner XL800 - PWC Forum: The best hang-out for Personal WaterCraft enthusiasts
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post #1 of 2 (permalink) Old 08-19-2019, 05:10 PM Thread Starter
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2001 Yamaha Waverunner XL800

I have two 2001 Yamaha Wave runner XL800's both right at 100 hours. I was wondering if someone could give some feed back on what might be the issue I am having with one of them. The ski will crank up after choking it for awhile, idle fine, throttle up and take off like it should, but after a few minutes of running it just dies. It will crank back up, throttle up, take off but then die again. After numerous attempts trying to keep it running, I then get a signal indicating something with the volts on my display. So I took back to shore, changed the plugs, took the battery out the other, and she fired right up, idle fine, would rev up like all was good, took it for a spin, after a few minutes, would die again, and start the same process over. So I ruled out bad plugs and battery. Not sure if there is some type of electrical component going out, some type of sensor telling the engine to stop due to lack of oil, heat, or what ever. I am fairly new to the jet ski world but not to turning wrenches, just don't what to look for on these two stroke engines. Any insight on what the problem could be would be greatly appreciated.
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post #2 of 2 (permalink) Old 08-20-2019, 05:25 PM
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Location: slower lower Delaware,second home on lake Conesus in NY. keep a 93&94 vxr pro there.
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Sorry wrote this yesterday and forgot to post it.

Here where I'd start. Do a compression test to determine motor condition. You don't want to run it more then need be if your loosing a cyl. A fresh motor should be about 130/135psi. Below 100 and a top end is needed.
Check the inside of the hull under the motor for 2stroke oil. if your still oil injected. The oil lines are always rarely serviced and are the weak link in sys.

Charge the battery overnight. Check the volts with a meter after being off the charger for a couple hrs. Should read 12.5/12.6 volts. If less the battery may be going bad. Place it in the problem ski and check volts then start ski and check volt. Should read 13.5/14 volts, running. If so charging sys is ok. If significantly less than that and we'll have to determine failure. Charge coil, regulator.

If all that checks ok, I'm leaning towards carbs need rebuilt. based off being so hard to start. I think I would rebuild them regardless.

Last edited by Dave in DE; 08-20-2019 at 05:28 PM.
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