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urgent Yamaha SHO question - prop exhaust build up #11896113 10/24/16 01:02 AM
Joined: May 2013
Posts: 231
KC_Fisher Offline OP
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I have a 250 sho and never noticed exhaust build up in my prop. last time I checked for sure was a few weeks ago when I removed prop tocheck for fishing line, prop was clean and castle nut was clean.

Today we did a lot of idling and a lot of low speed planed runs but did open it up to WOT at the end of the day for 10 miles. After pulling boat out the inside of prop and castle nut is covered in soot. It isn't horribly filthy like an old carbed motor but it's unusual for my prop.

I just had 100 hour service 10 hours back and everything was good

Does this sound normal given how I ran it today or does it sound like something to get checked out right away? The motor ran just fine today and when wide open it hit full rpm and speed

Re: urgent Yamaha SHO question - prop exhaust build up [Re: KC_Fisher] #11896124 10/24/16 01:07 AM
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KC_Fisher Offline OP
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And normally I don't idle and troll a lot so if this is normal given how I drove today that would explain why it was clean in the past

Re: urgent Yamaha SHO question - prop exhaust build up [Re: KC_Fisher] #11896556 10/24/16 12:27 PM
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gary purdy Offline
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Not a problem


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: urgent Yamaha SHO question - prop exhaust build up [Re: KC_Fisher] #11896596 10/24/16 01:05 PM
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Tommy Yetts Offline
TFF Team Angler
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Joined: Dec 2002
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It sounds like maybe a thermostat or two is stuck open and letting the motor run too cold. We haven't seen any SHO with a build up of carbon / soot! I would keep an eye on it.


Rockwall Marine
Tommy Yetts

www.rockwallmarine.com
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