Hi Mark, I have posted a link as to it running, sadly not in water?
It would NOT run with any water covering the exhaust at all so I pulled the pot off and found that someone had over bored the old thing, so far, that the crankcase compression bypassed back behind the piston skirt because of ever so thin liner and damage. The damage was done before it was put together thank God!
Someone found a piston and over bored the poor thing plus 0.140"
I had a port side barrel and piston spare so it will be back to standard soon. Just waiting on a set of rings.
Picture of bypass lower and running vid attached.
I will update when it is a proper concern.
I managed to colour match in 2 spray cans the green at my local auto paint shop. Enough to do the twin as well.