Hi Norm,
Thanks again for the response - I understood that the GXV160 is for a push mower, but the bloke I spoke to said they had a heavy enough flywheel and power for a small ride on. Then again, he was sure it was the same bolt pattern :-)
As much as I'm keen to get the Colt 8 running again, by the time I stuff around, it probably won't be much dearer to get a reasonable running 2nd hand ride on. I might keep the Colt 8 and wait for the right engine to turn up for sale.
I only have to mow 300sqm of tough buffalo every couple of weeks down the back. Currently doing it with a push mower, but it nearly kills me in summer with the heat and slope of the block. The buffalo hasn't rooted properly in a few spots, and it's turned into freaking grass matt where the wheels just sink straight into it.
Cheers,
Dave