I've had these carbs rebushed, but that was quite a while ago, so you may
have hit on it.
Then again, today while driving the throttle was sticking at 3000 rpm (!),
which seems pretty far open for it to be the butterfly.
I just found a spare throttle return spring, so I hooked it up as a double
on the center arm, stretched a little more than the first one. In a quick
idle test it seemed to behave itself. But I was on the road all day today,
getting home at 8pm, and I'l be on the road all day tomorrow, too, so I
won't get much chance to fool with it before my 800 mile weekend rally.
Just to make it interesting...
--
Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires
on 9/7/06 7:51 AM, Barney Gaylord at barneymg@mgaguru.com wrote:
> At 11:39 AM 9/6/2006 -0700, Max Heim wrote:
>> .... having trouble with them not always returning to idle.....
>
> When the throttle the shaft is worn it will move off center a bit due
> to action of the return springs. This moves the throttle plate off
> center where it can bind against the side of the throat, in which
> case it is reluctant to return to full closed. A quick snap, like
> slipping your toe off the side of the throttle pedal, can force it to
> fill closed and slow idle, but it is irritating. The proper solution
> is to replace the throttle shaft.
>
> In the meantime there is a temporary fix. Loosen the small screws
> which hold the throttle plate in the slot of the shaft so the plate
> can float in the slot. Back off the idle screw so the throttle plate
> will go completely closed. Nudge the plate a bit so it will come to
> rest touching the throat all the way aroud tthe edge, and tighten the
> screws to secure the throttle plate. Readjust the idle screw(s) for
> proper syncronization and correct idle speed. When the throttle
> plate is properly centered it will not bind, and the carb(s) will
> return to slow idle consistently.
>
> Barney Gaylord
> 1958 MGA with an attitude
> http://MGAguru.com
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