A eastern German Simson SR2 moped from 1958, used for demo races in the Netherlands and Germany, which are not about speed, but consistency. Stock cylinder has 1,5hp, ours has 4,2 which is frankly quite enough for such a weak frame. Fed by a easter German 19mm BVF carburator, home made expansion exhaust, and stock breaker points due to the rules. Pictures and information : https://demormm.wordpress.com/