Novemberkåsan is an extreme enduro event, that has run continuously since 1915 in Sweden. It includes competition during the day and night in icy conditions. In 1951 Borje Nystrom in his 350 Bullet won the event. His brother Rudolf came in 7th and two other Enfield riders finished the course, which eliminated a third of the entrants. The conditions were so grueling some riders fell asleep, one of them with his bike on top of him!