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We just bought a pair of 2000 yamaha gp1200r's. All stock, and runs on premix. Everything was going great until day 2 on vacation, we took it out for a ride, came back to switch riders and we had no power. Battery was dead and HOT. Well this morning after charging it, we went to put the battery back in and when we touch the terminals to the battery, the waverunner tried cranking over. We took apart the start button and everything looked clear and fine. Safety key was not in and the start button was not pressed down. So my question is what could it be?
Check your starter as I had similar on a Kawasaki when the starter solenoid had gotten stuck.

I would take the starter out and give it a good clean and spray it with a good electrical Marine spray.
the problem is that the Starters are normally in a hard to get spot when spraying the Ski after a day out on Salt water.
I like to fill my hull with fresh clean water and a good quality salt remover and then spray with INOX after I drain.
I only fill to a level that it flushes the engine mounts and starter as well as any clamps in the lower section you may not easily see.
I found I was having to many problems with my two old Two strokes and sold them both and got a newer Four stroke and haven't looked back since.
I now use less than half the fuel and even though the servicing isn't the cheapest, as it costs me $300 for a proper Yamaha service.
The saving in fuel makes up for that :)
Lucky the starters are not an expensive item for that Ski, good luck and hope that fixes your problem.
 

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Check your starter as I had similar on a Kawasaki when the starter solenoid had gotten stuck.

I would take the starter out and give it a good clean and spray it with a good electrical Marine spray.
the problem is that the Starters are normally in a hard to get spot when spraying the Ski after a day out on Salt water.
I like to fill my hull with fresh clean water and a good quality salt remover and then spray with INOX after I drain.
I only fill to a level that it flushes the engine mounts and starter as well as any clamps in the lower section you may not easily see.
I found I was having to many problems with my two old Two strokes and sold them both and got a newer Four stroke and haven't looked back since.
I now use less than half the fuel and even though the servicing isn't the cheapest, as it costs me $300 for a proper Yamaha service.
The saving in fuel makes up for that :)
Lucky the starters are not an expensive item for that Ski, good luck and hope that fixes your problem.
I should have said the throw out gear and not solenoid, but check the starter as it may be the culprit as the relay is probably fine as it sits up higher and behind a water proof cover, unless of course it's no longer water proof from some unhandy man playing about from previous owner and water has leaked into it ?
 
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