need some help please yammie 250

First before the begging-Hello board, I did not know that iboats had a forum or I would have registered years ago. I mainly salt water fish but in winter when things slow down I switch to fresh. Fishing is not just a hobbie for me it is my passion second to my family. I hope I too can help some of you out when I have the answer. Hate to start out with a question especially one so simple, I can't find my book so I will ask here just to make sure my guess is right. I have a single 2006 yammie with low hrs, it is a F250TRX. The over heat alarm went off yesterday while trolling, I would turn the engine off for a few then it would start fine, then the alarm would come back on after 2-30 minutes. After the 4th time I took her in. It was the over heat alarm, on two occations I ran to the back to ck the stream, I had a great stream but, here is the kicker the water comming out of the pisser was cold, the same temp as the lake felt mid 40s. So, that tells me the water is not going through the block, I replace the impeller and housing every year wheather it needs it or not. I back flush after every use with salt away or soap. My first thought was the thermostats went bad (I am sure it has 2 not just one, again can't find my book) but don't the therms go bad open and not closed? Also wouldn't it overheat faster when YOT? What is your thought, thanks

Re: need some help please yammie 250

t-stats will stick both open and closed...whens the last time changed? also check the water pump housing for any signs of melting....you'll know it when you see it. also make sure the flush attachment is tight and not leaking

Re: need some help please yammie 250

Might want to check the PRV to see if it is sticking open, dumping too much water while idling.

Re: need some help please yammie 250

what 99 said..

Re: need some help please yammie 250

How many hrs on engine? You could isolate it to one head or see if it's both with your hand(won't bite), think 99 is probably right, the poppit should be checked for crap build up....you could pull both t-stats(on back of engine kinda high up, facing rearwards, can't miss em) and with motor on hose you should get a good flow pouring out of holes at idle). You have a temp sensor on each head see....should be almost an even flow on both heads but right may be a little stronger at idle(normal). The engine didn't go into SLOW mode? Also, the pee stream on Yamaha's isn't water returning from engine so won't be warm.

Re: need some help please yammie 250

it only has 230hrs on it. In the past the the pee stream has been warm. And I am leaning to the PRV as well.

Re: need some help please yammie 250

sorry ment to add, I understand what you are saying about the stream no being warm , but if it is mixing with the return flow shouldnd it be warm?