Well I put it back together and tried it out on my lawn. It worked really well although it's speed was a little on the high side for a ride on mower so maybe I'd better get a better throttle control fitted as there is no way to change the gearing to slow it down.
The mowing was cut short as I needed to work on the cutter clutch; I had found some cracks in the cast iron I guess as a result of the welding that had been carried out on it (welding cast iron can be tricky due to the carbon content and the need to keep it cool to prevent cracking) so I didn't want to risk it. Just as well really as when I stripped it down again a big piece of the clutch was about to give way! I've made a replacement drive plate to fit to the pulley so will be fitting that together during the week.
I'll post some more photos of the revised clutch and mounting it to the engine.
I've also had permission from Greenfield to upload the documents they sent me so that other may benefit from them.
