I don't think that's the correct air filter cover, I'm pretty sure the right cover doesn't have an actual name plate, it should have "090" in raised letters, same as the Stihl letters on your engine cover.
Cheers skipster much appreciated.
I'm gonna put an 070 top end on it for now but if I can find all the contra parts I need, I'd love to bring it back to original.
Thanks again scallywag, don't know what happened to the original parts, I bought the saw minus all top end parts.
Is there a trick to getting the clutch off? The nut is off but the clutch doesn't seem to budge.
Cheers