[Rhodes22-list] yamaha 9.9 trouble

[fcrawford0707 at aol.com]

 Ben, John - my Yamaha 8 exhibits similar symptoms.? I have new fuel this spring, but the motor still craps out when I try to back down on the throttle.? I have had to keep the choke part way out under running conditions, except for pretty full throttle, when she runs fine.? I have tried two different marinas for fixing the problem ( including the dealer) and neither has found a solution.? I will try your suggestion for a carb cleaning additive.? Thanks, 
???? Frone Crawford
???? s/v Sunday Morning


 


 

-----Original Message-----
From: John Shulick <jsbudda at verizon.net>
To: rhodes22-list at rhodes22.org
Sent: Wed, 10 Jun 2009 7:59 pm
Subject: Re: [Rhodes22-list] yamaha 9.9 trouble











Ben,

 Regardless of what the marina said about the gas your description of the
problem sounds like a fuel/carburetor issue. Try pulling a spark plug and
see what the tip looks like it should be a nice tan color on the ceramic if
the air/fuel ratio is right. A black plug with carbon buildup would indicate
to rich a mixture and could point you toward a possible solution. Water in
the gas also comes to mind depending on how much fuel was left in the tank
and where it was stored. One other idea is if fuel was left in the carb
could have left behind varnish deposits in the carb passages when it
evaporated over the winter. As a cheap first solution I would consider fresh
gas and some gumout or a similar carb cleaning additive.

Good luck
John S

BenCittadino wrote:
> 
> So the S/V Susan Kay (93R-recycled08) is in the water for the next 4
> months after a winter in a cradle. She started right up and ran
> magnificently for about a half an hour as we motored the few miles out the
> Shrewsbury River (NJ) around to Sandy Hook Bay where she has a slip.
> However, as we cruised along at medium to low power (fog & rain) the four
> stroke 9.9 Yamaha began to die, fought alittle to keep running and quit.
> Attempt to restart (electrical) immediately succeeded, and she ran
> beautifully for ten minutes then sputtered and quit again. She restarted
> on the first push of the button, but died once more before we got her
> safely tied up in her slip. I'm at a loss except to say the gas was from
> last summer with plenty of Stay-bil. The engine had an oil change and was
> prepped by the marina where I stored her over the winter. They weren't
> worried about the gas (I asked). Why would she start like a champ, purr
> like a kitten, then sputter and die only to restart immediately? 
> 
> I'm also becoming concerned about the engine cover cracking some as it
> appears the attachment to the tiller is stressing the cover (I'm trying to
> be gentle). I'm considering locking the engine along the centerline and
> steering with the rudder alone.
> 
>  As a rookie sailor I must say I get a small charge out of the bridge
> tender answering my call on channel 13 by calling me "Captain", but I'm
> told I am easily entertained. Looking forward to a great summer, but
> considering chucking the motor altogether. 
> 
> Any thoughts? 
> 
> BenCittadino
> Highlands, NJ  
> 

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