I initialy thought I would just pull the head and check the condition of the motor, I also dropped the sump, lurking in there was a piece of aluminium, it's cast and looks as tho it is half a 6mm thread(female) so the motor has to be dismantled to find out what the !##!
plans are just new valves, pistons, rings, primary chain tensioner, bearings and maybe chains. I have a CV carb engine that I will experiment on re performance, but since there isn't a great deal of information available for these motors, this spare motor will be my " rip #$%* or bust project"