Hi, i am back again after another failed session on the dyno. Still getting the same issue of the bike running lean but also not wanting to rev either. This is with another set of carbs and a new airbox!!!!!!!
I have removed the intake rubbers and checked the gasket and reeds with no obvious problems showing so refitted. Also removed the exhaust on the one side where there was a slight oil/fuel weep on the barrel and ensured no signs of problems inside the barrel and refitted with a small amount of sealent on the exhaust flange.
So i am at a loss now, is there any way electrics could cause this problem. The bike has an HRC delimiter but i cannot imagine this would fail but unable to remove from the loom as i cannot wire back into the PGM. It has two grey plugs connecting into the loom [from the delimiter] and not the single black connector which fitts on the PGM.

Is there a difference between the black + piece for the air solenoids and the red item supplied with the jet kit?

Any other advise greatly appreciated before i loose heart.
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MC21 300
Aprilia RS250 track bike