last weekend I had a major problem with my B23 4 hp. Serious engine noises revealed a broken con rod which had managed to punch it's way through the top of the engine casing and pushed the rear the piston through the head and bent the crankshaft. I think I can salvage the piston, I have a crankshaft and con rod which will do the job but I am looking for a cylinder head, I could exchange a one piece barrel and head from a 4 1/4 hp. many thanks for any suggestions.
Wilf (Canberra)