Wiff - Thanks for the info. I'll have to take a look tomorrow and see what I'm working with (it's at work). I'm gonna predict "a" or "c" as it seems to only move my tonnage about 25 mph. The chrome tank looks great all polished up. The real oddity is the rear brake is a coaster, something I've never seen on a moped. It seems strong, but I haven't put it to the test. I gotta find a dirt road and see how she skids!
For now I plan on keeping it stock so I can use it while I work on the rest of the fleet.