My first true motorcycle was a 74 DT 100. Great bike, and since I used it as a street bike, it saw many miles @ 55mph. Topped out (me in the fully tucked in position) I hit 65 mph with it once. Make sure the injection pump NEVER runs dry or gets air in it. I took a few years off of the life of the motor when I ASSumed that just refilling the oil tank was okay after accidentally running it dry. The pump HAS to be primed, or no oil to the cylinder. Or, just run it premix and all is good. Even after moronic abuse like that, the motor still ran reliably- it just lost some UMPH.