u/TheJWT

Hi everyone, I just picked up a 1983 Passport C70 yesterday, and I can't seem to get it over 30 mph (48 km/h) on flat ground. I cleaned out the carb even though it wasn't too bad to begin with, and that didn't seem to do much. It could probably use a new spark plug, but again it's far from the worst I've seen. Where else should I be looking to regain the lost performance? Check the valve clearances? Change sprockets? I'm 185-ish pounds, so I don't think I'm massively too large for the bike. If I could cruise at 40, it'd be perfect for riding around town.