I sense a scientific experiment coming on! How much horsepower does it take to propel a dirt-bike and rider to 100mph? It would be fun to find out, if for no other reason than you'd get to ride a lot of bikes fast as hell. I think, if 37 won't get it to a hundred, it would get it close. I don't know how much power my 250 has but I doubt it's as high as 42, and when it's maxed out in sixth (which is an overdrive, BTW) there's still a lot of pull. If a '72 250WR can do 100, then the TE250 should at least be close.