Strange vee twin with jerky power delivery, clunky gearbox and heavy clutch. Some engines okay, others leak coolant, eat valves, pistons and electrics. Handling dodgy on early bikes but wear will’ve made later ones as bad. Chassis rot will’ve killed off those few bikes that managed a high mileage. Definitely a mistake to try to run one on non-standard filters or exhaust, but even stock the carburation was poor.