OK, Series 70 MKII and III are practically the same engine, the only real differences come down to some extrodinarily minor amendments to the carburettor, an updated coil, and a slight re-tune.
They are fully interchangable component and application wise
The 3rd engine, does it too have a metal carby? and does it have a decompression valve?
Cheers Ty
____________________________ Please do not PM me asking for support. Please post your questions in the appropriate forums, as the replies it may receive may help all members, not just the individual member.