I had to move the bike today. I started the bike up by putting the choke full on, turn the petrol taps on and hit the starter button. The engine turned over many times before it reluctantly chugged into life, one cylinder at a time. Once running it chugged along. The carbs are badly in need of balancing and when they are in balance it should run much more smoothly. I have bought a strobe timing light and need to use it on the bike to tweak the ignition. That too will make the bike run smoother.
Oil started dribbling onto the floor from the bike as it warmed up. I had a look. It was easy to spot the leak. The gasket on the oil filter cover is leaking. I will have to let the engine cool down before I start that job.