Ok so head repaired, camshaft outer bush changed and reamed and all back together.
I fed some petrol into the carb and tried to kick some life into the bike, nothing at all. I tried to choke the carb a bit (rag over the intake) which produced an engine ignition but also a massive kickback through the crank (ouch). Checked the timing (with a disc) which was spot on as per electrexworld 35.5 degrees. I retarded it very marginally. After the kickback I removed the footrests which get in the way with the U shaped lever and tried again. Same result, nothing until I choked it then bang a kickback (which I was more prepared for this time but still not good).
Any ideas what next? The fuel is from last summer which maybe doesnt help but how would that explain the kick back? I've checked the timing again and it looks spot on.
PS I seem to have created a second log on in the past with a different name on my work computer. TDub62 is me (Guy).