A little update on the engine rebuild, it all back together. Replacement piston and rings, bearings and seals.
First run is in the video below, after that I adjusted the timing and fitted another plug. Started with the good old CJ8 but changed it to the correct L14. Now it runs a lot smoother and will idle nice and low.
Not impressed with the carb on these, I have quite a few mowers fitted with them and they just wonοΏ½t prime. I have been right through them and they refuse to put out the extra fuel for starting.