I’ve been searching for a z125 pro for a bit now and I found one that has 6000 miles on it. I know that is a lot but will it last. What problems have you guys had around this mileage area?
I have a buddy who bought one with 9000 miles on it because it was cheap($1000) and it was getting tired. He didn't want to spend a lot of money on a big bore kit since it was mainly going to be a commuter, so I gave him a used stock top end to freshen it up. He rode it for a year like that until he wanted a 143cc upgrade. Finally, after another year and 12,000 total miles we went completely through it and replaced the crank, clutch, etc and installed a 173cc bigbore. The original parts were loose, but still serviceable. These are tough little engines with very few issues.
So if that bike with 6000 miles has been well taken care of(it looks clean, had regular oil changes, etc), I wouldn't consider it high mileage. Remember these bikes were designed as daily drivers for use in Asian cities that are clogged with traffic and they are expected to give years of service with minimal maintenance. In North America they don't see nearly the amount of miles they would in Asia. If the price is right, go for it.