I have a 2L Manual kombi with standard dual Solex carbies that has a very bad flat spot just above idle.

On close inspection of the Air Correction Jets I have a different one in each carby. 175 in one and a 160 in the other.

I have a 'Gregorys' manual and it lists what jets should be in what but I can't find the Carby indentification number.

Are there any Carby Guru's out there who know enough about Jet sizes of Solex Carbys to offer advice?

Extra info

Main Jets 132.5 same in both
Pilot Jet 50 same in both
These sort of problems remind me why I love fuel injection :thumb


Jeremy

[ Edited on 18-1-2006 by jeremy ]

Yep the vac advance is working and the dizzy has no slack or looseness in the shaft.

I pinpointed the Carbys (the left one) because if I hold the choke 1/4 closed on the left carby the engine revs wthout the flat spot.

So I in cleaning out the jets I noticed the different jet sizes.

It was left carby that had the bigger air correction jet (175) and appeared to be running a little lean.

It makes sence to me, I think. LOL

PS where can I buy jets from???

Don't know anything about Kombi's, but type 3's with twin Solexes's always had a bigger air-corrector jet on the LH side (passenger's side) carb. (Except '71 on according to one Manual, but not the other). I eventually decided this must be as the main on that side was always slightly bigger -- in order to make no. 3 cylinder slightly richer (so it runs cooler).
VW must have got worried about no. 3 cylinder early on as all later AirCooled engines seem to have at least some bias to helping it run a bit cooler. The type 3's spec's above were for air corrector jets of 155 or 150 on LHS, and 120 on RHS. The corresponding mains are only slightly different eg. 130 LHS & 127.5 RHS.
Air Correction jets are only meant to affect the running of the engine at higher rev's, and so probably have nothing to with flat spots at low to mod. revs. Maybe one of the mains is partly blocked, or an accelerator-pump not working?

If you're going to change jets, there's a good technical article at http://www.aircooled.net  "How to Jet your Carburretor/s". Describes the function/s and characteristics of idle, main, air-correction, and accelerator-pump; & how to experiment. We've fiddled around with jet changes recently. Came back to settings exactly as per the Manual on one car (1600; single Solex 34 PICT-4: 127.5 main), BUT had to use at least 140 mains instead of the standard 127.5/130 on a 1640 with twin Solex 32 PDSIT's. Probably depends on the individual engine! (I think you should have any other "issues"/faults sorted out before you start to fiddle with carb's.)

[ Edited on 19-1-2006 by ACE_76 ]

[ Edited on 19-1-2006 by ACE_76 ]

What's your location?

Cheers Dave

Ive had huge issues with the exact some carb's and running problems
After getting the carbs totally overhauled the mechanic said i had 135 jets that had been drilled out to 155 with was not supposed to be like that.
He replaced them back with 135's but I dont know where he got them
Mine IS an automatic though if that makes a difference

I have an 1800 dual solex. I feel your pain. It's back to it's old trick of dying when I put my foot on the accelerator.
Surprisingly enough, the gregory's manual gives a fairly decent description of how they work.