Hi, I have a 1980 250ra and 125ra. Like most of the other guys have said, they have a smoother engine with a good spread of power, definitly dont Rev as hard as the '79 RZ, but I love it that way. Play with the suspension (front and rear) and once right, they are a great bike to ride/race. I have some photo's of mine ozvmx.ning site. Cheers Frank Jnr