[AT] Spark Plug Fouling Ferguson TO20

[Cecil Bearden]

It could be oil fouling from valve guides.  Umbrella type seals will 
help, but you have to have some lubrication for those valves.   For the 
old ATVs when we went to high altitude, we had to change the jets in the 
carb.  Most industrial high altitude engines were labeled not for use 
under 5000 ft, and the compression ratio was about 8:1.  Domed high 
altitude pistons are as scarce as hen's teeth now.
Cecil

On 6/23/2019 5:29 PM, Szakaluk wrote:
> Request advice or suggestions on what I can do to reduce fouling on #4 
> spark plug on my 1951 Ferguson TO-20, here or to me direct.
>
> I've had it since 1990, only use it 8 or 10 hours a year. Field 
> mowing, snow removal, wood splitting (auger).
>
> Using 10W30 oil, Champion D21 plugs, which I understand is a hot plug 
> for this application.
>
> At first, I could go twenty or 25 hours between plug 
> fouling/cleaning.  Only #4 is a problem, others are fine. Using very 
> little oil.
>
> Now I need to clean #4 every six or seven hours.
>
> Appreciate your suggestions on how I can reduce this issue.  I know 
> someday the engine should be worked on, but with this limited annual 
> use I can't justify tearing it down.
>
> Heavier oil?
> Different plugs?  If so, on all cylinders, or just #4?
> Oil additives?
> Other thoughts?
>
> Thanks in advance
>
> Steve Zakaluk
> szakaluk at aol.com
> Falcon, CO
>
>
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