Need help ID ing Mcculloch motor. Mc100?

[Vince Rosanelli]

I'm certainly not an expert or even close to one, and am trying to learn as much as possible through resources like this forum and others and all the great folks on them. What I see according to the MacBob chart found in the link provided above, is that it suggests the MC75 came with RH PTO threads and beginning in 1966, the newly introduced MC100 came with LH PTO threads? It also states the MC75 came with factory 9 port transfer ports where the MC100 did not. It further indicates the 101, 101A and the 101A/A came available with either RH or LH threading. The 101B, 101C, 101D and the 101MC came available only in LH threaded PTO.