[Viney]

Sooty, as said, the chocke plungers, carbs (Blocked jets etc), dodgy plug (Swap plugs round), HT Leads, and coild could all provide this issue. Also if its only when raining, then its the water in the frontt plug issue.

Brakes, hmmm, when you say an overhaul, what does/did that involve? If the pisotns are all coming out at different rates, then they need to be FULLY stripped, cleaned, and possibly new pistons/seals. Both pistons in each claiper should come out together. Grabbing at straws really