RE: Yamaha 250 getting hot ????????
SET 4 Life is dealing with the same thing but on an 07 F250 w/ 250 or so hrs and it's been doing it since about 205 hrs, had a Yamaha service rep this weekend tell us he believed it was a partial blockage in the water passages
not sure if it fixed it or not but Lou ran it in a drum for quite a while with Salt Away in the drum...........
we had already done all the things you mentioned......2 or 3 new water pump kits, new poppits, etc. the F250 isn't actually overheating. It's throwing an overtemp alarm on the command link guages but the engine temp (bar graph) is still sitting at normal operating temp. basically the temp sensor is showing good but there is a thermo sensor in the top of the block and the water pressure at idle isn't making it all the way to the top of the water jacket and this sensor thus throwing the overtemp alarm.
first question would be, are you positive the engine is actually overheating or could it be a bad sensor? find the normal operating temp range for your engine and see if you can borrow a handheld temp sensor to run it andsee the actual temp of your engine when it throws the alarm.
Kenny Mann at Emerald Coast has been around and around with this one and on the phone alot with Yamaha........they're stumped also and want to know the fix when he/we find it.......
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