Got the 84 XL600R running and took it for a ride yesterday... DOGGY! esspecially on the top-end... I took the carbs apart for a good cleaning and everything looked good, I didn't note the jet sizes or the location of the clips on the needles (dumass) It has the stock exhaust that rattles... stuff broken off inside... I'm cheap, but looking for a Supertrapp & a K&N filter... If the carbs are rich & causing the doggyness, that may help... any oldtimes around with experience on the older 2 carb models know any other stuff to wake this one up?