>>Also... I'm not all that sure that the carb from the reed valve motor is set up the same as the one without the reed... so that may have played a part in why it wouldn't run.<<
Yeah, I checked that....they're the same, only difference at all seems to be the intake manifold you put on them.
As for the rod, if these are the kind where I can swap the rod arm or whatever that widget is, imma take the good one I have and do that, with the right size piston, whenever Ike gets around to reading his Email, that is.
As for the flywheel and keypin, the cursed keypins are way too small stock, and in truth do not fit up right, they're too short, and the fit is loose, even brand new - so it shouldn't be impossible to have one machined....it's probably "hardened" tho, so I have to ask some folks that supply odds and bits to the "Big Three" what can be found or made along those lines.
But yeah, the DelLorto 14/12 carb that comes with em is identical in every aspect save for the intake manifold attached to it.
I've looked into this a bit, and they did make some A3 type heads (the hexagon shaped ones) that used a reed valve, but you would no doubt have to buy an offset intake manifold to fit the carb up.
The intake mounts just off to the left (your left if yer behind the 'ped, mind) on the A3 cylinder, but is dead-on straight on the A5(A35) head, so be aware of that, cause for the A3 you need the offset intake, and for the A5(A35), just the straight one - AND make sure to check whether or not you need the oil injector screwhole, cause they make em both ways.
And, umm...try to deal with a parts guy who isn't going to tell you "There's no such thing!" like they did with me, tellin me no A3 piston ever had a 12mm wristpin - it saves a lot of hassle when you don't have to convince the parts guy that said part exists at all in the first place.