has any one looked at making the non powervalve governor adjustable
 

looking at the 018 set up it looks possible

I guess it would be possibly. Buy, would be expensive.

You can adjust the earlier power valves, through the internal shims.

the 015 on. adjustable shaft is only ?15 if it fits all iv got to do make a cap/nut and drill tap out the clutch cover.got a used 98 pv governor of ebay to play with.any one got a 015 on pv gov to hand they can measure the shaft need diameter length slot position / length of slot thanks