I completed the resto on the bike including new rings on the pistons, the bores were in very good shape. All this was achieved for just over a grand and around 600 pleasurable hours of graft. However, it proved to be extremely hard to start and would only run on a high throttle opening.
This prompted me to strip out the crankshaft and replace the main bearings, which were in surprisingly poor condition. I also replaced the oil seals.
Now the engine starts much more easily but will only run on choke. As soon as I attempt to push it in it stalls. The carb was meticulously cleaned during the resto and the tank went round in my cement mixer full of gravel, washed out and sealed.
Any ideas would be very welcome guys.