I was running 46 pilot jets so reduced by 2 points at a time down to 40.
This was a lot better but getting popping in exhausts so too weak. But the plugs were still black.
Tick-over is controlled by pilot screw, allowing separate supply of petrol/air, richness being determined by the jet size.
I needed to have the pilot screw turned out a long way (too far I believe) to maintain reasonable tick-over.
The transition phase when the throttle is opened slightly is controlled by the slide cutaway.
I was running 60-3 slides (weakest)
Changed these to 50-3 (richest) which had a profound effect. Much better transition and low speed cruising in town.
Further trial with 38 pilot jets was not good, unable to get good idle and transition.
Back up to 40, still not happy with left cylinder so increased that side only to 42. Much better.
All used throttle openings were fine with smooth cruising at 50mph, steady idle at 750rpm, good transition and acceleration.
Note the accelerator pumps fitted to the slides give a squirt of petrol every time the throttle is opened.
Plugs were still black so dropped the needles down one notch to 2 from top (weaker). Better result.
Satisfactory result which has eliminated the backlash roughness when cruising slowly in 20 & 30mph zones.
