Gave the carby yet another clean, the starter mechanism was squealing so I lubricated a few places and that's quietened it down. Put it all together and it sounded healthier, it took a few goes but it starts and runs, it stalls after 10 or so secs. It never reaches full revs ie missing here and there, it wants to keep running but it just doesn't quite get there. It was getting late so I had to stop. Getting closer but not getting that nice continuous revving that it should have.