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1996 80hp C80TLRV 2-stroke Yamaha overheating

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fishfun83

New member
Went fishing today. Motor ran perfectly when idling along. Went to go to a different spot about 2 miles away at 3/4 throttle and the boat started running rough after about a mile and a half and the overheat warning buzzer came on. Waited for about 20 minutes, restarted the engine and idled back to the boat ramp. The pump impeller was replaced about a year ago and there is an excellent pee stream. Any ideas on the problem will be greatly appreciated.
 
With no response from the community, I ordered a new thermostat with gasket along with a new pressure control valve with spring and grommet. Will install early next week.

My question now is: If there is water coming out of the pee hole at a good clip, does that mean that the cylinder head is getting good cooling?
 
I would still look at the impeller and take some pictures for us. The impeller and it's base plate should look almost pristine.. no deformation in the fins and no gouges on the plate. To me, that's the most likely issue. Next time you get the warning, make sure the pee stream is actually hot. If it's cool or only slightly warm to the touch, it's probably not overheating and you have a bad thermoswitch or CDI unit.
 
rejesterd said:
I would still look at the impeller and take some pictures for us. The impeller and it's base plate should look almost pristine.. no deformation in the fins and no gouges on the plate. To me, that's the most likely issue. Next time you get the warning, make sure the pee stream is actually hot. If it's cool or only slightly warm to the touch, it's probably not overheating and you have a bad thermoswitch or CDI unit.
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The thing that makes me think that the engine IS getting hot is that when the buzzer went off, the engine started running poorly. (missing).
 
fishfun83 said:
The thing that makes me think that the engine IS getting hot is that when the buzzer went off, the engine started running poorly. (missing).
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I agree, it probably is getting hot.. but you have to confirm, otherwise you'll be chasing your tail. Most of the time, this is either an impeller or thermostat issue. But if it's not actually getting hot, then it's a sensor/computer/electrical issue.
 
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