hi there im new to the forum and can i just say it looks very helpful indeed.I have a dt125r 1990 on a g plate and just had a rebore and new piston i have a small question it has a powervalve but not one thats operated by a servo(if you know what i mean)How do i make sure this is in the correct position as mine seems to spin free and doesnt look like anyway of locking it off,I really dont know how its supposed to work any help would be great and not start the bike since replcaing the piston as i dont know what damage can be done by the pv being in the wrong postion?

Is it not a cable operated servo at all then?? If it is then you could try adjusting them so they stop it turning?

Im not completly sure how it can spin freely? Must be connected some how?

nope not connected to any cables, think i have worked out why its spinning its missing it brass sleeve that holds/locks the powervalve in place.