The mixture adjustment is only for idle mixture. Once
the throttle is off the stops, the mixture is
controlled by the size of the jets. Only adjustable
by changing the jets for different sizes or drilling.
I doubt that your sooty head is caused by the idle
mixture. It could still be carb problems, like a
stuck partially closed choke butterfly, but I'd be
willing to bet the cause is elsewhere. Good advice to
take the head to a machine shop and have them check it
out.
Can't remember, but are you the one with low
compression in one cylinder?? If so, without serious
evidence of cylnder problems, the only other source
would be head problems.
Aloha
Peter O.
--- David Scheidt <dmschei@attglobal.net> wrote:
>
> >Finished pulling the cylinder head - and found the
> exhaust valve in
> >cylinder #2 had a couple of pie-shaped gouges in
> it. Beyond that,
> >all of the valves look pretty sooty - which
> coincides with my sooty
> >spark plugs (I had them in there for less than 30
> minutes running
> >time and they came out coated in black soot) - so I
> guess I get to
> >lean out the mixture screw on the carb once I get
> everything back
> >together.
> >
> >So a couple of questions :) First, I'll be
> ordering all of the bits
> >to replace the exhaust valve, plus the replacement
> head gasket.
> >Rest of them look fine - so is there anything else
> I should be
> >ordering while I have this torn open?
> >
>
> Take it to your machine shop first. Get it
> magnafluxed, checked for
> flatness (and milled flat if needed) and so on.
> They can then tell
> you if it's worth fixing or not; they'll also tell
> you if you need
> guides and such. Minimum is to do all the exhaust
> vales and hardened
> seats (your shop can probably supply these for less
> than a rover
> parts place) and seals and such.
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