It was my understanding that the ZS carburetors in TR6's were sealed to
prevent adjustment, which could defeat the emissions controls, which were
in part derived from leaner mixtures. Is this some kind of adjustment the
books don't tell you about?
Jim Ruwaldt
'72 TR6 CC79338U
Bloomington, IN
On Mon, 27 Oct 1997, Pete & Aprille Chadwell wrote:
> Mike:
>
> To my knowledge, all TR6s fitted with ZS carbs had a mixture adjustment.
> The adjustment is made by inserting a tool into the dashpot bore and
> turning either clockwise or "anti"clockwise. If my memory is correct,
> turning the screw clockwise richens the mixture and the reverse leans it
> out. (What's happening here is that the needle is being either raised or
> lowered in the jet, creating either more room around the needle through
> which fuel can flow, or less...) You need the special tool to do this... I
> have seen two different tools, but they both do the same thing... provide a
> means to hold the piston in place (keep it from rotating when you turn the
> tool) while allowing the adjuster inside to be turned.
>
> On my TR6, I cannot get a rich enough mixture. As I understand it, this is
> most likely the result of worn throttle shaft bushings, which are admitting
> air into the intake downstream of the venturi, resulting in a lean air/fuel
> ratio. You may encounter the same difficulty. It is repairable, however,
> by removing the carbs and having them rebushed.
>
> Good luck!
>
> Pete Chadwell
> 1973 TR6 CF10732
>
>
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