Hey there trusty SOHC'ers. (would that be pronounced 'soakers'?)
I just purchased a 1978 750 A with 8k miles. I had promised my friend the old 500 but we fell out of touch and I sold it... so got this one for him. He redid my whole bathroom for only 2500 bucks so I figure I still owe him!

Anything I should know? Honestly the auto tranny is freaking me out a bit.
It runs on starter fluid and everything appears kosher except the turn signals (which beep? and flash really fast... probably wrong bulbs) and the brake master cylinder which doesn't appear to have all of its internals. Guy was running it with only the back brake apparently.
I'm posting because I don't see a common issues thread or a FAQ. If this exists for the special systems on the A model please direct me there. I haven't dug in yet - going to clean the carbs first.
Thanks!