It is interesting how many versions Pioneer made from that one design format. I assume the differences were in CC's? Cool that you still have a working primer. I looked at the exploded view and it looks like the diaphragm is cone shaped and would be difficult to duplicate.
Here is what is left over:
View attachment 465943
Piston and cylinder could be used but no rings are present. Crankcase no good due to studs being cut off. Coil is bad and the black handle top with non-functional primer is going to Jim. Clutch is missing but sprocket is good. I don't think either of these saws ever cut wood, so the carb is NOS and all the metal parts are in good condition other than paint being perfect.
I am open to trade for any chainsaw related stuff I can use to decorate my collection area. I have lots of STIHL stuff so I am looking for signs, posters, collectibles or anything else from other brands.