ignition timing - the mind of an explosion

[jimbob-mcgrew]

If you are having idle issues the secondary choke is not part of the issue at all. It could be as simple as some crud in the idle jet or fuel filter. On top of the carb there are some brass fittings, one has a slot for a screwdriver, thats the idle jet. Unscrew it and spray some carb cleaner threw it. The pipe that the rubber fuel hose connects too has a small filter inside it, hook it out and see if its blocked up. If it is throw it away and fit an inline filter in your fuel hose somewhere.

idles better now that ive fiddled, its ready for secondary.
ive stripped the carb and blown it all out, and pulled that filter out.

the vacuum is 'controlled' from the manifold. its what's used for load sensing. how have you adjusted the throttle pump? that doesnt do anything for steady fueling, it just rides up the cam on the butterfly and gives a squirt to enrich the mixture as the air speed drops across the venturi.

it wont use the secondary until its in a high load (accellerating) situation. so that should be pretty much shut until the vacuum and throttle position requires it to open.

did you ever get your timing set? how did you do it, and what is it set to?

i adjusted the little cam lobe on the backside of the butterfly shaft, so theres earlier engagement of the pump, it actually idles steadily for once now, and ive got the mixture screw exactly 3 full turns out.
timings set at zero degree's (the gun says) - a cm from the pin toward the waterpump side, seems happiest there, so im leaving it.

the only manifold connected pipe goes to the choke diaphragm.
the secondary throttle connects to the lower half of the carb

[meritlover]

ignore the gun if its one of those adjustable ones. they are only any use if you have a TDC mark or you know what youre doing. The notch on the pulley should line up with the mark on the casing at idle speed and with the vac hose plugged. job done.

if the timing isnt right to start with then you wont know where you are with the carb. for instance. if you were running too far retarded then you would have to open the idle screw so far out to make the idle speed up that the mixture screw wouldnt be doing anything and it would start trying to fuel from the main jet.

youl end up fudging the carburation to get it to run right and you wont know where you are.

[jimbob-mcgrew]

ive got a TDC mark, 1cm away from the factory 10 degrees BTDC mark.
it takes alot of skill to drive the car without stalling it, set anywhere else.
its running almost good at the moment. i need secondary throttle tho.
ive ordered a gasket kit, hopefully it brings the vacuum back ?

[meritlover]

well, sounds like you've got it sorted anyway