Ha! Try a 1954 BSA 500 single with a 13:1 racing piston. Cheezus.
That would be a serious challenge. The BSA 500 could kick back. Mine was only 12.1:1. It was an MX model. I would have another if they were offered for sale today.
“ Ha! Try a 1954 BSA 500 single with a 13:1 racing piston. Cheezus.”
One of my classmates had one of those that was made in the early sixties. It was a scrambler model. We went out to an area outside of Tucson where everyone played hill climb with their bikes. The kids with their new Jap bikes had to make a running start. Ron lined up with the base of the hill with his old BSA and just let out the clutch and climbed right up the hill.