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September 29th, 2008

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Q & A: 1970 MGB

Tuesday April 02nd, 2002
Q & A, MGA, MGB, MGC, MG T-Type, Midget
Hi John,

First, let me say that I recently checked your tech tips page out and it
is very, very nice. Thanks for all of the information. I have two
questions for you. And here they are:

I have a stock 1970 MGB with dual S.U. HS4 carbs. This car is so
difficult to start in cold weather. When I pull out the choke, I don't
feel the accelerator being pulled away from my foot like I thought I did
when I ran another set of S.U.s on my 1976 B. I thought the first 1/3
should be a fast idle-like movement.? Second, even when it is warm, if I
pull out the choke the whole way out, the engine doesn't 'load up' like I
thought it would. It idles the same with the choke in as it does the whole
way out. Does this mean that the choke/fast idle mechanism isn't working at
all on these carbs? Any suggestions on what I should do or with what might
be happening there? What should I look for?

BILL!

Have your associate (Kim?) pull the choke while you watch the carbs.
The jets should drop AT LEAST 1/4" from the bottom of the jet bearing. If
they don't, then you'll have to lubricate the linkages.... read more