Still not arrived, apparently next week now. Lets hope there's no more delays! In the mean time I blew up my KM engine and looking at the piston it looks like it ingested something. New piston, ring and head fitted along with a new carb since the old one had serious wear round the throttle shaft. This engine will serve as my spare once the Pro MX has been built and fitted.
At least the rebuilt KM started in 2 pulls, first time!