22-06-17, 06:39 AM
If it's one of the many that I've 'Ivanised', I promise you it won't be a problem caused by over-cutting the throttle slide springs (I deliberately do them less than Ivan recommends), or incorrect setting of mixture screws (unless someone has messed with them later - perhaps when it was serviced recently?) or improper refitting of the carbs back into the intake stubs. 
If you decide to fit stock carbs again, you would hate it. Not only would you have to do much of the same work necessary to check the Ivan's installation anyway, you'd lose all the torque and peak bhp gains that come with the Full Monty. It's a lose-lose proposition.
Try adding a bit more throttle slack at the adjuster at the throttle end and see if it changes anything. While hanging revs typically suggest an air leak, this sounds like it could be mechanical to me.
If you decide to fit stock carbs again, you would hate it. Not only would you have to do much of the same work necessary to check the Ivan's installation anyway, you'd lose all the torque and peak bhp gains that come with the Full Monty. It's a lose-lose proposition.
Try adding a bit more throttle slack at the adjuster at the throttle end and see if it changes anything. While hanging revs typically suggest an air leak, this sounds like it could be mechanical to me.