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Old 06 September 2007, 07:38   #1
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Yamaha 50hp overheating??

I have a 1999 Yamaha 50H 2 stroke outboard

I have a tell tail of water which is warm but not red hot.

The leg of the outboard seems to get very hot and if you splash sea water on it it tends to steam a bit especially after a long run. How hot is the outboard leg supposed to get after its been running for a while??

I also seem to get a lot of steamy exhaust from the point shown on the picture below - what is this outlet as I thought all the exhaust exited though the prop!!??

Many thanks

Gareth
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Old 06 September 2007, 11:52   #2
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Originally Posted by ZodiacFuturaMk2 View Post
I have a 1999 Yamaha 50H 2 stroke outboard

I have a tell tail of water which is warm but not red hot.

The leg of the outboard seems to get very hot and if you splash sea water on it it tends to steam a bit especially after a long run. How hot is the outboard leg supposed to get after its been running for a while??

I also seem to get a lot of steamy exhaust from the point shown on the picture below - what is this outlet as I thought all the exhaust exited though the prop!!??

Many thanks

Gareth
How hot is very hot? Can you hold your hand on it?

The exhaust bypasses the leg at the point you show the gas escaping so that it doesn't have excessive back pressure at low speeds-that's fine.
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Old 06 September 2007, 12:16   #3
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Its hot but can hot a hand on it - its just when cold sea water hits it it tends to steam. Probably about 40-60 degrees maybe???

G
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Old 06 September 2007, 14:11   #4
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It's fine then
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Old 07 September 2007, 23:41   #5
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My Yamaha 40 2 stroke warms up similarly to what you're describing.
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Old 08 September 2007, 06:36   #6
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Is this common on engines. I've never seen it before but thats something else to check next time I'm out !!
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