I had Katana GS150 when I was in 4th grade in College. That was long time ago. I remember it is 5 speed and not the International patten. It is circular pattern. I actually make the linkage up slide down to make it reverse. Go up for next next gear, push down for the down gear.
I own it for two years, then give up and get a RZ135. That year was a 2T era.... I always EAT smoke from DT125 or RZ135 when I sit on Katana.