Hi all,
I beg to differ with Rick O in his agreement with Andy that the TR250
and
early model TR6 fixed-jet carbs could be adjusted by screwing the brass
plugs up and down. At least on my own car, a very early TR6 built in
November 1968, the brass plugs simply seal the large hole in the bottom of
the float chamber. I believe that all TR250s and TR6s had carbs designed to
meet the new 1968 smog regulations and came with both fixed needles and
pressed-in jets. However, I believe that the earlier TR4A Z-S carbs had a
mechanism to actually raise and lower the jets to adjust the mixture. On
the TR250 and early TR6 carbs, significant mixture adjustments require
moving the needles up and down in the pistons, or raising or lowering the
press-fit jets in the carb bodies. I just had my carbs rebuilt by Joe Curto
in New York, and had Joe convert my carbs to adjustable needles. I believe
the conversion was an extra $90 for the pair, but I'm sure that it will be
worth it. However, Joe also mentioned that he has a device that he sells
that works like a little puller to move the jet in the carb body, and that
it can be used without removing the carb from the car. Joe has a website at
www.joecurto.com and he can fill you in about all kinds of English
carburetor lore!
Rex Townsend
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