Here is my xl 250 roadracer which I use in the nordic  classic racing. it is a 1972 in a cb 350 frame.

megacycle cam and racing valve springs with titan retainers, JE piston and a 38 vm mikuni. homemade down pipe and low noice can (98 db in nordic racing) 11-1 comp. lots of work done on the top end,  ca 30 horsepower on the wheel. fun to ride and on the podium when the two strokes break down !