tuning carbs and engine stalling

[Rust Bucket]

ok, so im not sure if this is what caused it, but today i tried to.."tune my carbs," meaning that i tried to make the mixture right. i twisted it all the way counter clockwise (which i think/hope is lean) and then i turned it two and a half times clockwise (they're stock SU's on my '72 240Z). there is now a bunch of smoke coming out of the exhaust, and when i was driving it i would step on the pedal and it would almost feel like i was engine braking, my car would actually SLOW DOWN when i stepped on the gas..

did i do something wrong?

what might have caused my car to do that?

[beandip]

Did you balance the carbs air flow? If the balance is off the carbs cant otherwise be set. Backing out the nozzle 2 1/2 turns is only a starting place to get the engine to run , so you can warm it up then adjust the mixtures . Use the search feature, there is all the information you need there and more on this issue. I am vary willing to help. If you cannot find what you need there send me a PM. Gary

[Mat M]

Gary is on the right track. Do you have a unisync tool?

If you search the SU questions forum, you will find your answers. Paul at Z Therapy is an excellent source of SU wisdom.

[Dreco]

Gary is on the right track. Do you have a unisync tool?

If you search the SU questions forum, you will find your answers. Paul at Z Therapy is an excellent source of SU wisdom.

ditto on that.. i bought one of his tuning videos awhile back.. helped a great deal.

is the timing correct? valves adjusted? Getting good spark from the coil? (that gremlin cause me a track day once)

[Rust Bucket]

Gary is on the right track. Do you have a unisync tool?

no, i don't..