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Problem with exhaust on Yamaha 225

Old 08-08-2004, 09:26 PM
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CD
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Default Problem with exhaust on Yamaha 225

The problem is their is no water coming out of the exhaust port
on the rear of the engine. Their is water coming out of the pee hole,
lower unit holes, and the prop. Do you think it has to do with the
thermostat? And also the case between the lower unit and the engine
feels a little warmer than usual. Great help would be appreciated.
Thanks
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Old 08-08-2004, 10:06 PM
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Default RE: Problem with exhaust on Yamaha 225

You say there's water coming out of the lower unit holes, so I am assuming your running on the muffs? I dont get any water coming out of the upper exhaust ports on the muffs either.
Put the motor in the water and you should see a little spray from the ports, even at idle.

Hope this helps... Tyee.
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Old 08-08-2004, 10:18 PM
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Default RE: Problem with exhaust on Yamaha 225

Had the boat running in the water today and still no
water coming out of the exhaust ports. What about
poppit valve?
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Old 08-08-2004, 10:38 PM
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Default RE: Problem with exhaust on Yamaha 225

Hmmmm...
Was this just at idle, or did you get a chance to have a look back there with the rpm's up? Like I said, on my 200, I get just a little water spitting out of those ports at idle.
I would think if your poppit valve was'nt working, you would get a overheat alarm.

Tyee.
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Old 08-09-2004, 08:06 PM
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Default RE: Problem with exhaust on Yamaha 225

Even at idle and with the RPM raised, still no water comes out of the
exhaust ports. I called Comstocks today and they said their is nothing wrong.
If anything they said to replace the water pump. I just don't understand.
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Old 08-10-2004, 07:18 AM
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Default RE: Problem with exhaust on Yamaha 225

When the poppit valve is working properly, you should get some "shooting" out of water from the exhaust on these Yamaha's.

Try revving the motor in neutral, then quickly bring it back to idle. See if it then shoots out. Bear in mind that it doesn't do this all the time.

Otherwise, clean the poppit valve assembly, including the area under the rubber grommit on the engine itself.

John
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Old 08-10-2004, 05:51 PM
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Default RE: Problem with exhaust on Yamaha 225

A good question for SIM. You out there.
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Old 08-10-2004, 09:02 PM
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Default RE: Problem with exhaust on Yamaha 225

one of mine was the same way.
one would "ka-sploosh" water out.
and the other would only spray a fine mist. untill it got up to 3000rpm's or so.

check the poppet valve. down under the cdi ignition, small,,,,, say, one inch hose comming off it. has a spring loaded valve under there. if any sand gets in there it can stick.you will need a new gasket.make sure it goes back in the right way{very simmilar on both ends, but one end is a little smaller}

mine was never resolved.
and i ran like that for four years.
i had to rebuild the powerhead and after i took the powerhead off, i found a big hunkitty-chunk of some kinda metal lodged in one of the holes {shotty work from a prior job probably}
works fine now.
mike
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Old 08-10-2004, 09:38 PM
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Default RE: Problem with exhaust on Yamaha 225

Just got done removing the poppit valve and it was full of sand. Put a new one on
and hopefully that solved the problem.
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Old 08-11-2004, 09:55 AM
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Default RE: Problem with exhaust on Yamaha 225

so, what is a poppit valve? got any pic's?
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Old 08-11-2004, 05:41 PM
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Default RE: Problem with exhaust on Yamaha 225

Well guys put the boat in the water today and everything is
running normal. What I did was I replaced the poppit valve
with a new one. Thanks for the replies.
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