Rex,
I believe you are correct about the TR250 carbs, but I could swear I've seen
EARLY TR250 carbs with the adjustment on the bottom. Not in person, I saw
them for sale on e-bay. I've seen different variations of the TR250 carb.
Some that have the plug on the bottom & some that have a bolt that's
threaded in(similar to the TR4A) without an adjustment...I have a set of
those...that's why I believe that such an adjustment on a TR250 carb may
exist. I have a set of TR4A carbs & as far as I can tell the parts are NOT
interchangeable. Probably won't need to TR4A carbs anymore...in fact I have
2 sets. The linkage is opposite the TR250/TR6 as well.
Anyway, check out buckeyetriumphs web site. I think swapping over to the
adjustable needle is as easy as changing the piston from early to late.
Todd
From: "Rex Townsend" <rrt@connectexpress.com>
Reply-To: "Rex Townsend" <rrt@connectexpress.com>
To: <6pack@autox.team.net>
Subject: Early model Zenith-Stromberg carbs
Date: Mon, 19 Apr 2004 22:42:02 -0700
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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