i had a 1990 dr 750 big . it was a great bike .i bought it in sydney , australia where it was used to commute at very high speeds. then i moved back to the bush where it was used as a work horse also at very high speeds .. in the bush i used a 52 tooth sprocket which cut 30 kms per hr off top end , meaning 170 kph max . but turned it into a grunt monster. ... other traillies ive owned include 1987 xl 600 rmg and 1985 xt 600 tenere which were both ok for 600s...