YS-91 AC problem

[Verne Koester]

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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