Grumpy, that's very likely. I also seem to recall that the Fuji Robin they fitted in the early 70's was a bit underpowered compared to the Honda. Only recall running across one of those, back in the day. Just to create more confusion, here's an extract from a 1971 Supaswift [the then Greenfield agents for the southern states] ad that mentions four engine options, and some interesting attachments:
See if
this link to the full page works. I can only recall the Fuji Robin fitted as being 6hp rating, but then Greenfield tagged the Honda as 8hp [maker's rating 6.8hp].