Ylli, If anything it's running rich, as the plug is black, although that could be from all the idling, trying to get the bike running well. There is an air/fuel mixture screw, and I've adjusted it w the idle speed screw to get idle lower. Although I could do more w the mix screw, now that I've got the transistor ignition. That will be next, but I expect the changes to be minor. Note I replaced the orig. simple carburetor with a more sophisticated new old stock Dellorto. It's in great condition (new) and a big improvement over the orig. equipment.
Diver, in another thread last year, I explored getting a high performance coil for this bike. The consensus between this board and the coil manufacturer is that it wouldn't work. I'm trying to remember.....and I think it's that w a single cylinder engine the dwell is very long and would overheat the coil. The performance coils are made for multi-cylinder 12v engines, and not suitable for vintage single cyl. 6v bikes. I bought a performance coil, and tested it out on the bench, re dwell and overheating. I recall the tests were good on the overheating, but there wasn't any spark improvement over the 50 yr old orig coil, so I'm running that.
Shortbus, the generator is known on these bikes to be too weak, barely charging the battery, so you're right there. But the battery is less than a year old, although it's only 6 or 8 amp-hr, which is small by any standard. I could modify the frame to fit a larger battery, or go lithium, but remember; hooking up the charger while running didn't affect the idle performance. If the added input of the charger didn't affect things, I feel a larger battery might be a wasted effort.
Am I wrong on this?
Joe