the BSA 441 VICTOR weighted in at 336 pounds, wet with 29 hp.
The Victim was introduced in 1964 as a 420cc factory competition machine and won a couple of world Championships. It weighed about 270 pounds. The 360 2-strokes took over after that. the production was introduced in '76 with 441cc.
The Husqvarna 500 won the last of the big thumper WCs in 1963 after the big thumpers had dominated the World Championships since it was started in about 1948. In the late 50s, the little ringdinger 250s were beginning to dominate the 250 class (Greeves, Husqvarna, Maico, etc) and were much lighter and better handling than the 500s. People started entering them in the big class and winning, so the FIA mandated the minimum size for the 500 class was 350cc. The factories started working on the 360 2-strokes, but BSA hung in there with the 4 strokes until their demise.
A 1960 Matchless 250 Scrambler still weighed over 300 lbs.
Royal Enfields off road forte was trials of both the observed trials and the cross country (Enduros, by Americans) stuff, but Royal Enfield had a fairly competitive scrambles machine in the early '50s, but in '55 when they introduced the new frame, it broke in severe racing conditions so RE got out of the scrambler production mode for local consumption. They didn't stop building the Scramblers entirely, as they sent the entire production to the US as Indians as Americans wanted Scramblers. They were fairly successful as the Americans tracks weren't as rough as the European tracks and the bikes would hold up to the rigors. Enfields also did quite well in flat tracking. The Indian Scrambles versions were the Fire Arrow (250), Woodsman (500) and Westerner (500)
Bare