34ICT Setting up.

My mixture screws have to be wound out to run properly. They were at 2 and a half before I stripped them, and now they are at 3 turns to run nicely. Though I haven't fitted the gauge yet as I ran out of time. I will have a go tomorrow if the weather is ok.

 

It is possible that the throttle plates are too far open and you are compensating with the mixture screws to get them to idle properly. with 55 idles, 3 turns is a lot.

 

So which do I set first?

Set throttle plates properly with feeler.

Then ignore them.

Set mixture at 2 turns.

Start it up.

Then what do I do if it won't idle? Coz this is the problem I had. Can't set it up if it won't stay running? So I wound idle screws in to get it to idle. Then set the mixture. And have since backed the idle back off again.

It seems to be a bit cat and mouse like.

 

Throttle plates with an 008" feeler gauge. place it between the plate and the body of the carb. Turn the idle speed screws until it just slides out under its own weight.

do this to both carbs.

Then the mixture screws to 2 turns out.

It should then tick over, but probably too fast.

I got a mate to start it while I dipped the two throttles to get it going as they can be a bit lumpy when cold anyway. It then ticked over at about 1000 rpm.

Then set the mixture.

Then set the tick over using the balance gauge.

This is a very helpful resource... http://www.cbperformance.net/pdf/WeberICT.pdf

 

Right, I'll give this a go then. The engine is a long way from the ignition so it's hard to do on your own lol.

 

Thanks and sorry for keep asking basically the same question loli

 

No worries at all. I learned all of this from setting up mine. It is a dark art.

 

Sorry, my instructions received were slightly different.
Throttle screw with feeler, then turn in Throttle screw one full turn clockwise. That should be the idle circuit engaged.
Mixtures should be initially screwed in all the way, then out 3 full turns. Thats it. Engine should at least idle some when warm.

From this point, with the snail balancer on the top, I then set left carb first using the throttle screw, and only turned it slightly out or anti-clockwise to get the 6 to 700 rpm idle.
Then right hand carb and match the value on the snail type balancer. On my car it was 4, with the side breather hole on the balancer wide open.

Lastly, I then turned the mixture screws the same amount in half a screw I think. It doesn't make much of a difference at this point, the engine should be ticking over perfectly.

This is also presuming the linkage system is perfectly set with zero hook ups or anything catching or preventing absolute zero return of the throttle arms\springs. I added another spring to the top of the linkage and the roof of the engine bay to be sure the pedal is returning to normal.

Im sure every motor is different, but I've stripped, cleaned out and reset the carbs 3 times since initially fitting them, and the settings are almost identical each time.

good luck.

Alan