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Old 29 December 2008, 18:48   #11
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had the same problem on a mariner 4hp which i believe is the same as the yam,changed the impeller problem solved hope this helps
If you already have experiemented a engine overheat, would be advisable to torq head cylinder to factory specs as the head gasket will be a bit lose due to heat. Engine will work better.
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Old 12 January 2009, 17:03   #12
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Sorry its took me so long to reply, I lost my internet.

Anyway, its a 2 Stroke. Thanks for all the replys, when I get a minute I'll pull it apart and have a look.
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Old 30 August 2009, 13:39   #13
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thermostat

I am also new to this, so please bare with me
I have a Yamaha 2 stroke 4HP and the water dose not flow out in a smooth pace.
I have change the impeller and still no difference.
Can you tell me where the thermostat is.

Thanks, neol
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Old 30 August 2009, 15:34   #14
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i cannot comment on your particular make but not all of the smaller outboards have a proper tell tale water stream squirting out or with yours it could be just blocked up where it comes out ,with some it just goes out with the exhaust relife ports as a fine mist ,and most small engines dont have a thermostat,
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Old 09 May 2010, 18:21   #15
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Well its been about 18 months since I posted this topic and I've finally got round to looking at it tonight.

I took the water pump to bits and the impeller looks fine and clean. I tried the engine in some water mainly because its been a while since it was run and I couldn't get it to overheat, it most need to be underload/in gear before it gets hot enough for the tell tail to turn to steam.

So whats next? Take the head off?
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Old 10 May 2010, 15:48   #16
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Originally Posted by Metalface View Post
Well its been about 18 months since I posted this topic and I've finally got round to looking at it tonight.

I took the water pump to bits and the impeller looks fine and clean. I tried the engine in some water mainly because its been a while since it was run and I couldn't get it to overheat, it most need to be underload/in gear before it gets hot enough for the tell tail to turn to steam.

So whats next? Take the head off?
No, change the impellor. It might look fine does not mean it will work though. 4 years is a long time for an impellor change eitherway.

If it then overheats I would move on to water passage cleanup etc.
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Old 10 May 2010, 17:26   #17
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Thanks mate, I'll give that a try then.
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