Exactly, want to richen up the progression stage (will also need some jetting and idle air bleed mods) by reducing the number of holes to match non-emission (i.e. performance) carbs.

But, I have also read that these carbs are very good road carbs due to the style of idle and progression circuit they have, almost self-tuning in some way, just that they don't work so well on smaller bore engines.

Cheers, a bit of photochopping to get the pics the right size and then time to try making a disc to drop into the hole..

Can anyone that has a set of "non-emission" Dellorto DHLA 40's take a picture (close up like the pic below) of the progression circuit drillings for me? Also if you have jet drills and are able to measure the sizes of them that would be even better!
Non-emission carbs should only have three holes in the progression circuit and the code should be just DHLA40 without a suffix.

Pic of emmission progression drillings, note five holes:




I have a pair of DHLA40F's that I paid pocket money for, so I want to see if I can mod them to fix the idle and progression circuit issues associated with them.
Figuring a precision sleeve for the idle air bleed and a precision disc glued into the progression circuit to convert it from 5 holes to three.

If it pumps up rock hard then I don't think there is much air in there and it is more likely an adjustment problem. If it is spongy then most likely air in the system.

I am glad there are guys with the knowledge and skills to do this cause if I saw this in mine it would scare me the feck off!

Found it!

Here!

There is definately a thread within the last month or so that has pics where the fella has unpicked the plenum.
Can't find it at the moment but will keep lookin..

When you pull the choke, does it crack the throttle plate open a touch? There should be a linkage between choke plate and main throttle shaft. If this is missing, can cause poor cold starting.

Think that job was more than days, try weeks! He bought the car in May and posted in Sept after working most weekends..

I think I would just buy a new car

Bump..