overheating

F

fishingrv

New member
Looking at v20 1992 with a 175yamaha .. Worked out all the miner stuff with boat and motor...ran motor 2times to check comp everything was good. Went today to demo boat before I purchace it. Checked motor with ears on before putting it in water and it overheated in a few minutes. It didn't do that the two previous times i was there. Any help out there????:sun:
 
Yamaha V6's will over heat on flush muffs(some do, some don't). The factory recomends using the built in flushing hook up and flush muffs. Those water pumps are tempermental and can burn up if run dry, try it again with the boat in the water
 
Went thru the same with my 92 150. Like he said it was running fine on the muff while I was checking out everything after doing some maintenance work on the boat. Five to ten minutes into it alrm went off. Had not done that before.
went thru changing out TStats checking everything. In the end these fellows told me to just put her in the water, guess what? no alarm
It is a Yammie idiocyncracy. Hopefully that is all yours will be
 
ditto w/ my 150 yami. I take her to the lake after the salt. I can count on one hand how many times I've put muffs on it. The alarm did not go off the first few times because I shut it down after noticing poor water flow coming out of the pisser. Last time I was trying to work out an idle issue (this year) and needed to run it longer. It probably wasn't more than 2 minutes and the alarm goes off. It just can't get enough water up where it needs to be with muffs only.
 
It has to do with how the Yammies are set up for drainage, even though you have good hose pressure they do not build up enough pressure inside to keep things cool, especially on a hot day.
 
My 98 200 Yami flushes easily with GOOD hose water pressure, but if pressure is low, sometimes it will not flush with "earmuffs". If pressure is low, I have to lower the engine so it picks sea water along with the muffs hose water, then when it starts flushing, I raise the motor and at high idle it continues flushing on hose alone, but I have to keep a close eye on the cooling water stream in case it stops.
 
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