I just got my first moped, a 1975 Hercules P1 with a Sachs 504/1BS. It's got a 85/10/101 Sachs Bing carb, and true to the sticker on the side, tops out at 20mph.
Is there anything I can do to improve performance that's relatively simple? (doesn't require boring or welding). I've been reading as much as possible over the last few weeks and it's looking like the Sachs, while reliable, are maddening to performance tune.
I thought I'd start with a better air filter and a larger jet, but the square bing carb jets look impossible to find. Would a 12mm carb help me out? Or is the intake so small that it wouldn't do any good? Would a different exhaust make a difference?
I'd be happy with even the smallest improvements. I just don't know where to start. I'd love to hear from anyone else with a Sachs 504.