Rick,
What I remember was that #4 runs a little hotter as it gets the tail end of
the coolant flow and the least amount of air. Go ahead and bring the
adjustment down a flat at a time and see how it goes.
Mobile Bill
On Nov 17, 2010, at 5:35 PM, "Rick" <chandler.rick@comcast.net> wrote:
> I did a plug check on my TR3A today. While the front two plugs looked great
> (light tan insulators), # 3 was much darker and #4 was sooty. Plugs are NGK
> BP6HS. I seem to remember a discussion here a year or so ago concerning #4
> running cooler than the other cylinders. I checked the archives, but no
> cigar. Anyone remember this discussion? I'm planning to lean out the rear
> carb a few flats (HS6s), but I'd rather do it with a bit more information.
> Car runs fine, with only 800 miles since the rebuild.
>
>
>
> Rick in Seattle
>
> 1960 TR3A
>
> 1970 BSA 441 Victor Special
>
> 1972 Norton 750 Commando Combat
>
> 1975 Norton 850 Commando Mk3
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