250 overheating

[Deltajoe]

Anyone have a problem with their four stroke overheat alarm going off@idle? Mine did it 2 times last weekend, I shut it down waited a couple of minutes and jump on plane as long as I was running I would be ok. Is this something I should up with the dealer?
Thanks,
Joe

 

[Uncle Matt]

What year motor? How many hours? Has the motor been serviced recently? A little more info would probably benefit the guru's here.

 

[B-Faithful]

When was your water pump last serviced? How many hours/seasons?

 

[Deltajoe]

Had the 10 hour service done a couple of weeks ago 2006 motor 16hr on it now. Thanks for the response.
Joe

 

[goinsfishin]

Take it back to the dealer. Sounds like the water pump impeller. Shouldn't be a problem after only 16 hrs, but those are the symptoms you describe.
Did you or the shop possibly run the motor with loose muffs or using the flush hose ?
Either will kill the impeller quick.
The other possibility is an internal clog of some nature.
Either way with a new motor - back to the dealer.

 

[Uncle Matt]

Definately not good. Don't use it until the dealer corrects the problem.

 

[Deltajoe]

Taking it this morning ,Thanks

 

[mildew2]

Sounds like impeller for sure. I had same problem, thought it might have been faulty thermostats. I changed them but did'nt help. Problem got alittle worse with time. Pulled bottom unit and found that the center hub on the impeller had broken loose and spun sometimes causing the intermittent problem. Good luck..Kinda puts a little doubt in your mind each time you go out until you know the problem is fixed.

 

[Burtona]

Had the same problem with my carb 150. It was the water bypass valve stuck open. Didn't keep enough water in the block when at idle and alarm would go off. When a few rpm's were added it went off and cooled normally.

 

[John_Madison CT]

Your Yamaha probably has a poppit valve. These are known to cause low RPM overheating.

 

[Deltajoe]

It was the poppit valve sticking,
Thanks for the replys
Joe