Marvelous. Just marvelous
Please ID the three levers; one above and one below on the left handlebar and the one above on the right.
Thanks, Tooseevee. On the left, starting at the bottom - valve lifter lever - this actually operates a lifter at the base of the exhaust pushrod, opening the exhaust valve itself a little. Next the clutch, obviously and the top lever controls the advance / retard of the magneto timing, with the lever pulled back [tight cable] giving full advance in this case, although magnetos with slack wire advance are also available and my preferred type, as you can keep going more easily if the cable should break.
On the right, there is the brake lever, as usual and above it, the choke lever, with tight wire for 'off'.
The most demanding machine I have ridden was a 1926 AJS 350, which had a total of six levers, three per side [no twist grip, the throttle was a lever, too], plus the gear change lever on the side of the tank!
https://youtu.be/bm9aZfESKAY B.W.