I'd say if you are blocking 80% that you have an air leak somewhere.
These are H4 then not HS4?
Check for vacuum leaks. Reset the carbs to the starting point and try
again?
On May 13, 2008, at 8:34 AM, Robert J. Guinness wrote:
> After rebuilding the cylinder head and carbs on my 1961 MGA (with 1800
> MGB 3 main engine and original MGA carbs), the engine fired right
> up . .
> . to 3000 RPM! It appears that the rear carb is causing the high
> revs. If I block about 80% of the rear carb's air inlet, it calms
> down
> to around 1500 . The front carb is behaving appropriately. I
> assume I
> have issues with the jet because the adjusting nut will not tighten.
> Here are my questions for the group's wisdom. What is/are the likely
> cause(s)? Can I fix the carb without removing it (man is space tight
> around there -- but I hate dealing with the carb stud nuts, vacuum
> tube, spring holder, etc.)? Can I just remove the rear carb? Any
> helpful techniques or procedures to deal with these issues? Please
> note
> that when I use the word "can", I really mean "should I do it as
> part of
> "best practices".
>
> Thanks.
> --
> Robert Guinness
> 1961 MGA
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