I have a 1986 with a happy button that Doc and myself have been playing with.
Good points:
Lighter than the 650 by quite a margin ~140kg dry for the e-start
More dirt orientated frame geometry
A real donkey first gear
Both kick and e-start... and will kick start with a flat/no battery.
Bad points:
Stock forks and shock suck if you are an average South African size
As Lecap mentioned some parts are discontinued but Doc has a work around for most
Rear brake is a drum but works ok if adjusted properly.....sliding the rear is no problem!
Front is a single pot caliper on a small disk.
Head light sucks
If you are looking for a bike to use as a starting point to build a fun bike the 600 make a good choice.
This is what my bike looks like at present..... but the front end is about to change to WP 50mm extreme conventional forks soon, including decent front brake
