Many years back I owned/raced an Original Cincquechento Fiat 500 fitted with the " Arbarth" tuned unit opened up to 600 cc's motor with brake & suspnsion mods used to corner on 3wheels to let the unit cool properly it had a tubular frame that propped the rear engine cover part way open Slow by todays standards but in the 60's they went like the proverbial s**t off a shovel