hey i just picked my self up a 73 dt250 my self new rebuild on the motor except piston my bike seems to be running great in nutreal but its only doen like 60km when topeed out in 5 and picks up like crap i played with the carb was finaly getting it to run with the choke open havent had a chance to ride it and test it out tho but is yur bike picking up slow and has no power realy feels like a 80cc 4 stroke and doesnt do even half the speed its suposte to try playen with the carb and clean it out all the way and play with yur fuel and air screw