Geoff 2
Well-Known Member
I am rebuilding the above & have noticed something I have not seen or [ noticed before]. The carb is in exceptionally good condition & appears to be original, has original rods & jetting.
It has an adjustable idle air screw [ LH thread ] but no visible idle mixture screws. It does have mixture screws but they are hidden behind plugs. I have seen these before.
With the pri t/blades cracked open with as little as 0.020" of t/slot showing, the vac adv port is exposed. The carb, as received had about 0.060" of t/slot showing which exposed all of the vac port. I don't know if this was how it was run on the engine it came off. If the t/blades are closed so that no t/slot is showing, the vac adv port is no longer visible.
So my question is: since carbs normally have some t/slot showing at idle, on this carb vac adv would be activated. So is this carb designed to work on manifold vac adv at idle? Or.... Is the carb designed to run with the blades nearly closed, no t/slot showing at idle, & run with ported vac adv?
Thanks.
It has an adjustable idle air screw [ LH thread ] but no visible idle mixture screws. It does have mixture screws but they are hidden behind plugs. I have seen these before.
With the pri t/blades cracked open with as little as 0.020" of t/slot showing, the vac adv port is exposed. The carb, as received had about 0.060" of t/slot showing which exposed all of the vac port. I don't know if this was how it was run on the engine it came off. If the t/blades are closed so that no t/slot is showing, the vac adv port is no longer visible.
So my question is: since carbs normally have some t/slot showing at idle, on this carb vac adv would be activated. So is this carb designed to work on manifold vac adv at idle? Or.... Is the carb designed to run with the blades nearly closed, no t/slot showing at idle, & run with ported vac adv?
Thanks.