Going to take a look at this little KE100 after work today, been thinking about a little beater just to get around town while the 750 is down for the rebuild. Anybody know anything about them other than the fact that they're small, light, underpowered, and awesome?
Good score! Kawi has made these from 1969 to 2003. The rotary valve 100 can be modified to have the same port timing as the G31M dirt bike which made 18 hp.
A buddy of mine did the port mods and added a pipe, now he's getting a top speed of 70 mph in New Mexico (the elevation difference works out to about a 20% loss)
Through the 70's there were lots of motor refinements but essentially the same motor from 1982 up. Lots of parts can be found so you are in good shape with that one, enjoy!