YS-91 AC problem

[Ken Thompson]

Well all, I guess there's no easy fix, a little labor and some careful 
re-seating and it sounds like this motor will be good as new.  I'm not sure 
what early fuels this engine has seen, but from my can will only be 
Powermaster 20/20.

Thanks again for all of the info, I'm off to Norfolk.

Ken
----- Original Message ----- 
From: "Verne Koester" <verne at twmi.rr.com>
To: <discussion at nsrca.org>
Sent: Thursday, June 02, 2005 11:46 PM
Subject: Re: YS-91 AC problem


> Ken,
> Never had any luck with solvents and I tried a bunch of different ones. 
> Bob Kane has the right idea in scraping it off with a tool softer than the 
> valve itself. The #11 blade fits the bill.
>
> Be careful if you decide to use an abrasive to remove the carbon. That 
> stem is a very close tolerance fit which is why a small amount of carbon 
> can make it stick. If you remove any metal by sanding, you'll have other 
> problems to deal with.
>
> Verne
>
>
> ----- Original Message ----- 
> From: "Ken Thompson" <mrandmrst at comcast.net>
> To: <discussion at nsrca.org>
> Sent: Thursday, June 02, 2005 10:04 PM
> Subject: Re: YS-91 AC problem
>
>
>> I'm going to try to find a solvent to soften the carbon, at the local 
>> auto supply, and use a brass wire wheel to remove the balance, still in 
>> theory.
>>
>> Ken
>> ----- Original Message ----- 
>> From: "Bob Kane" <getterflash at yahoo.com>
>> To: <discussion at nsrca.org>
>> Sent: Thursday, June 02, 2005 9:52 PM
>> Subject: Re: YS-91 AC problem
>>
>>
>>> The carbon is tuff, I scrape the stems and valve edge
>>> clean using some tool softer that the valve. The first
>>> time I saw this I thought the edges of the valve had
>>> broken off, but it was the rough edge of the carbon
>>> buildup.
>>>
>>> --- Ken Thompson <mrandmrst at comcast.net> wrote:
>>>
>>>> Paul,
>>>>
>>>> I'm going to pull the head and drop the valves out
>>>> to clean them.  Is there an easier way?
>>>>
>>>> Ken
>>>>   ----- Original Message ----- 
>>>>   From: Paul Horan
>>>>   To: discussion at nsrca.org
>>>>   Sent: Thursday, June 02, 2005 9:29 PM
>>>>   Subject: Re: YS-91 AC problem
>>>>
>>>>
>>>>   Ken,
>>>>       What did he tell you to do the cure the carbon
>>>> problem.
>>>>   Thanks,
>>>>   Paul
>>>>     ----- Original Message ----- 
>>>>     From: Ken Thompson
>>>>     To: discussion at nsrca.org
>>>>     Sent: Thursday, June 02, 2005 7:22 PM
>>>>     Subject: YS-91 AC problem
>>>>
>>>>
>>>>     Thank you to all who gave me places to look for
>>>> my problem.
>>>>     Somebody gave me the thought that maybe it was
>>>> carbon deposits on a valve, I'm sorry I don't
>>>> remember who.  I dismissed this theory because the
>>>> valves seemed to be operating properly.
>>>>     Early this morning Mike Darr stopped by to check
>>>> out my damaged Excelleron and took a look at my
>>>> motor for me.  He manually worked the valves and all
>>>> of a sudden the compression came back.  It looks
>>>> like there was carbon on the valves after all.  He
>>>> told me what to do and I should have it fixed as
>>>> soon as I get back from Norfolk, a little trip this
>>>> weekend to go out for the day on the USS Theodore
>>>> Roosevelt.
>>>>     Thank you all again and thanks to Mike for
>>>> showing me what to do.
>>>>
>>>>     Ken Thompson
>>>
>>>
>>> Bob Kane
>>> getterflash at yahoo.com
>>>
>>>
>>>
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