You guys are lucky, sweet bikes. They had an optional street/light kit. ( mine has no options, and I had to make a jackshaft:sadcrying4:)
MOPAR OR NO CAR!!
I have three 5hp flathead briggs motors from mid 1960', they are 10cubic inches. I also have a 5hp from 1972, that specs at 13 cubic inches. They are all 3/4" shafts. I think people used to say "big block" to differenciate between the two. Tecumseh did the same.
However I bet on a dyno they...
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