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Author Topic:   6hp Yam. Overheat

hardensheetmetal posted 06-07-2003 08:14 PM ET (US)
A while back I asked for some advice about a 6hp 2000 yamaha 2 stroke that was showing little to no cooling stream while it was running. I stuck a pc. of weed trimmer string up there and it seemed to improve. Today, I ran the motor for about 7 minutes and it quit, before it stopped, it was showing only drips of cooling water. I had arrive where I was going, so I did not resart until about an 45 mins. later. This time it ran for about 3 minutes and quit, but this time it showed slight smoke coming from under the cowling. I figured I may have cooked it, so I rowed the rest of the way.
hen i got home I checked it out and everything turned over by hand OK. I put water to it and it started right up, but no stream, so I shut it down.
Waterpump?
Thanks
Dan
pamlico posted 06-08-2003 07:27 AM ET (US)
I would check the water pump. It could be a thermostat sticking. It could be a water passage around the head that could have some blockage from sand that the water pump has picked up. Take a air compressor and blow air into your water discharge area and see if this breaks it loose any. To check to see if its your thermostat, crank your engine and put your hand on the head of your engine. Your motor will be a little hot at first,....but should cool down within a minute or so after the thermostat has reached its proper operating temp. If the engine stays hot to touch and you cannot leave your hand on the head for extended period of time I would suspect a sticking thermostat.
hardensheetmetal posted 06-08-2003 08:16 AM ET (US)
Thanks,
I'll check those out.
John from Madison CT posted 06-08-2003 10:01 AM ET (US)
Dan: Replace that Impeller ASAP, same for the Thermostat.
Hate to say it but you'll have a hard time finding a local Yammie dealer with those parts. Boats Inc. in Niantic will 95% of the time.
Stop by the Icarus.
John
hardensheetmetal posted 06-08-2003 11:41 AM ET (US)
John-
we brought the boat back two weeks ago (increadibly enough it was raining). We stayed over Friday night, but I had to leave a little early yesterday as I had a wedding to go to. I will stop over next time I'm there. My boat is in G41 (on the end).
I met a carpenter from Madison over at the town ramp yesterday, so I think I may have finally found someone that will work on the shack (and he has his own boat to get there which is a huge plus).

Dan

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Author	Topic: 6hp Yam. Overheat
hardensheetmetal	posted 06-07-2003 08:14 PM ET (US) A while back I asked for some advice about a 6hp 2000 yamaha 2 stroke that was showing little to no cooling stream while it was running. I stuck a pc. of weed trimmer string up there and it seemed to improve. Today, I ran the motor for about 7 minutes and it quit, before it stopped, it was showing only drips of cooling water. I had arrive where I was going, so I did not resart until about an 45 mins. later. This time it ran for about 3 minutes and quit, but this time it showed slight smoke coming from under the cowling. I figured I may have cooked it, so I rowed the rest of the way. hen i got home I checked it out and everything turned over by hand OK. I put water to it and it started right up, but no stream, so I shut it down. Waterpump? Thanks Dan
pamlico	posted 06-08-2003 07:27 AM ET (US) I would check the water pump. It could be a thermostat sticking. It could be a water passage around the head that could have some blockage from sand that the water pump has picked up. Take a air compressor and blow air into your water discharge area and see if this breaks it loose any. To check to see if its your thermostat, crank your engine and put your hand on the head of your engine. Your motor will be a little hot at first,....but should cool down within a minute or so after the thermostat has reached its proper operating temp. If the engine stays hot to touch and you cannot leave your hand on the head for extended period of time I would suspect a sticking thermostat.
hardensheetmetal	posted 06-08-2003 08:16 AM ET (US) Thanks, I'll check those out.
John from Madison CT	posted 06-08-2003 10:01 AM ET (US) Dan: Replace that Impeller ASAP, same for the Thermostat. Hate to say it but you'll have a hard time finding a local Yammie dealer with those parts. Boats Inc. in Niantic will 95% of the time. Stop by the Icarus. John
hardensheetmetal	posted 06-08-2003 11:41 AM ET (US) John- we brought the boat back two weeks ago (increadibly enough it was raining). We stayed over Friday night, but I had to leave a little early yesterday as I had a wedding to go to. I will stop over next time I'm there. My boat is in G41 (on the end). I met a carpenter from Madison over at the town ramp yesterday, so I think I may have finally found someone that will work on the shack (and he has his own boat to get there which is a huge plus). Dan