Message text written by Geo Hahn
>I've set the TR4 carb mixture using the method described in Haynes of
cranking the jet all the way up then bringing it back down 3 turns.
Seems to run okay but is there a method for dialing in a more exact
setting?
The manual describes lifting the piston 1/32 inch with the result being
no change in engine speed if the mix is correct... speeding up if to
rich, stalling if too lean. Is that an adequate test? I'm willing to
drive -- stop -- adjust -- rinse & repeat -- if that is necessary but
would need to know what I am looking for, i.e. what are the driving
symptoms of too rich or too lean?
<
George, the ZS carbs used on the TR4 had special pins for lifting the
pistons for this test (as do most SU's). As I recall at least one of them
is in an awkward position and is best activated by a screwdriver. Be sure
that the idle is set low enough (800 RPM) that the pistons will be low
enough for the pin to give significant lift. In other words, if the idle
is so hing that the pistons are already ar 1/32 there will be no lift and
you will see no speed change which will be a false indication of correct
mixture.
Good luck
Dave
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