The starboard engine on a Yamaha Exciter Jet Boat (EXT 1200W) cuts off when it warms up but it is not overheating. There is no spark when this happens.
I have a 1998 Yamaha Exciter jet boat as well and am having a similiar problem. I just took it in today and the mechanic believes that it may be the oil pump failing which causes the pistons to stick and not lube the engine properly, thus causing overheating and eventuallly stall. The one motor sounds beautiful and the other sounds unhealthy. He checked compression and it seemed fine and it has new plugs. Maybe this is the same problem you are having...Hope this helps...
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I had put the temperature gauge on it and it was not overheating. I put a timing light on it and I could see the erratic spark and no spark when it stopped. It turned out to be water in the front cover, all up in flywheel and stator.I cleaned it out and put in a new stator. The sensors seemed to be sealed so I left them alone. This cured the stopping problem. It still is running a bit rough but I think that it might need the carburetors cleaned. This engine is a two cycle and I don't think it has an oil pump.
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