week 4 of fault finding so could do with some supportive words and suggestions to get my MC18 MK1 to run properly.

She ran well before I got the engine rebuild - crank bearings were on their way out. Got her back together but she does not run properly. She has a TA12A carb with 130 main jets (128 is std), 38 Pilot, air screws 2 1/8 out, float 13mm, NGK B8ECS plug. Same setup she had before the rebuild.

Symptoms: she starts cold without choke first kick, revs to 5000 for a min or two until she settles to ~1800. She accelerates upto about 4000 in any gear, stuttering around the 5000 rev mark. Increasing the throttle slightly gets her to move slowly to 6000. When rolling off the throttle she holds at 3000 for 10 sec until she settles back to 1800.

What have I done so far:
- cleaned carbs, replaced slow jets and main jets, measured float, reseated air screw
- bought a new battery, checked voltage at 13.3V off and 14.35-14.40V running
- checked the RC valve – they switch on at 2000 and off at 3000 rpm so indicate normal operation
- checked all solenoids visually
- plugs seems slightly rich (albeit no real riding to date so)
- checked tank breather to make sure it was not blocked
- replaced the tap and filter and checked the fuel lines
- swapped the coils with a new set

Current conclusions:
Looks to me that its electrical - I do have a spare PGM CDI so my next action was to swap that to see if that makes any difference.

Before I do that any other suggestions? She does smoke considerably more on the front than the top cylinder. However, she only had a heat cycle and 4 times around the block with several idle sessions so not sure that this is an issue. Tx