Hey mate, Nathan from facebook here.
Yep absolutely certain that engine is incorrect, Greenfield didn't fit a briggs to anything until about 73. everything early was Honda and as this one is very early would have had a G30/32/35/40 depending on what they could find back in the day.
PRD That is my thought, There is a fair few differences with Lewis' machine, but going off the fewer slots in the grill i would have to reckon it is older than the ones that I've seen. its a shame Lewis isn't still on the forum to give us a bit more insight. At the very least we know it had to be built between 66 and 67. I would liken it to an in between model, bits of the early one and bits of the next model, a lot changed over a very short time frame back then.
These early machines were never serial numbered, nor really documented in any way that I am aware of. Lewis did mention machine #1 was dismantled for the parts diagram, and I have seen the red machine manual, it was posted on this site a while ago, however it is for the more common machine like mine with the dog clutch on the deck.
The centrifugal clutch is a great idea, not original though. this machine looks like it had the clutch setup of the later ones like mine going by the post in the front of the frame.
As for you're drive not turning, can you turn any of the pulleys with the belt on? I would be suspect on the pulley that is where the deck was. if its bearings are seized nothing will turn. as when you engage forward or reverse it will try and turn the belts.
As I've said I would love to put this old girl back together, just let me know.
