Hi AI_T

Been up and running a week (approx 1000 miles) with no problems. made sure key was a tight fit (had to use screwdriver to remove it) also made sure gears were a tight fit as well (but not so tight as to damage bearing when tapping the gears back on the shaft and key).

But will report if and when I have to take it to bits again; but if it does happen will probably most likely do a rebuild and look at doing one of kevs big engine mods and changing piston or piston and crank (raptor crank).
Ideally will look for a s/h engine to rebuild and then at least I have some transport to carry bits to machine shops if unable to machine at home.

Fergus