you need to bu a powervalve, a servo and a contol cable, take the blanking plate out of the valve slot and put the valve in.
and change the plug, derestricted ones are br10eg i think. restricted is something 8 or 9. they've got a cdi restriction (not the 123 ones) but its just environmental dip from like 5-6k rpm. got to gouge out the back of the cdi to remove it.