Hi Grumpy,
OK the fuel tap has a wind in wind out type tap. screwed clockwise the tap is closed anticlockwise its open. I have had the mower for years and used it for years so i haven't mistaken which is on and off.
I will check the fuel flow tomorrow it's after 10.30pm here in NZ
The Diameter across the top of the flywheel is 16cm or 160mm
the circumference is 160mm x 3.14(pi) = 502.4mm (had to look that up on the net)
Pete
