I think you are starting to confuse the
HS50 with an
H50 they are totally different engines. There is a dimensional size, configuration, and weight difference between the 2 engines. Your 1st post in this thread was asking about a specific HS50 (which btw is a 1976 mini
bike specific version)
HS is a small frame engine
H50 is a medium frame engine. That is why the
S had to be put into the designation code when both the HS40 (1968 start) and HS50 (1972 start) came out.....at the same time they made an H40 and H50 engine which were also 4 and 5 hp engines but were based on a much larger block design.
since you posted the way you did, you were referring to small frame engines only so I gave you the info for those in regards to your application.