Hi Maurice, thank you for your further information,and being as I have stripped the engine down completely since I took the photo’s,I have reffered to your sizes and give you the sizes of my engine.
Flywheel – 128mm. dia.x27mm. face with 6 spokes.
Piston diameter – 32mm. with a 38mm.stroke.
Still not convinced that it is a Stuart,but I do respect your views,and by the way I am 70 years old at the end of next week,also “ouch”.
Regards, Dave.