setting up pict 3 carb

[lard]

So I've had an issue with stalling on idle - not idling on the drive, that's fine! - it's after driving and slowing to a stop it dies - refuses to reproduce the problem on my drive

I've put a replacement carb as well as dizzy and leads, plugs e.t.c. - set it up as per bentley and the volkswagen guide site with 2.5 turns out on the small screw but makes no difference, if I set it up to about 3.5 turns on the small screw and adjust the larger inwards to get revs to ~850 then this is much better,

Question is - is this masking the issue (whatever it might be - changed carb, dizzy, leads, plugs e.t.c.) or is the 2.5 turns out on the smaller screw a rough guide or a strict rule? Just after some input into how others have setup their carbs as I'd hate to be hiding the idling issue

Ta,

Larry

 

[Slammed]

Well, no two carbs are the same, and if they didn't need to be adjustable then there would be no need for the screws, right?
It's true there is a limit to how much you should adjust your carbs, but a turn or two either side of 2.5 isn't a major issue.

 

[lard]

Well, no two carbs are the same, and if they didn't need to be adjustable then there would be no need for the screws, right?
It's true there is a limit to how much you should adjust your carbs, but a turn or two either side of 2.5 isn't a major issue.

haha - good point on the adjustable element, cheers

 

[cyberdyne systems]

I rebuilt an OG carb and fitted it and set it up as you describe, and it felt better turned out more as you had to, at first i thought i may have another problem, but it honestly runs so well on its current setting that I think its just a variation between different carbs

 

[mattyd72]

The 2.5 turns is just for basic set up, the large screw should not be used for adjustment that is the mixture screw.
If my memory serves me. Start by making sure the engine is fully warmed up with choke fully off, then check the stepped throttle thing (can't remember the name) you should be able to slide a piece of paper between that and the stop if you can't, screw it it in/out until you can.
Then get the thing running using the small screw, then when you have that set, screw in/out the large screw until it the sounds the smoothest, if you are screwing out go for the highest revs when it starts to drop go back in a touch.
Then adjust the small screw to get your desired tick over and step away!!
Job done