I have a 1990 model CBR1000F that is my main touring bike these days if I am riding without my wife (then it is a 1993 R100GSPD.) I bought it new and it will turn over 60,000 miles (mostly touring) here pretty quick. The only issue that I am aware of with these engines had to do with the cam chain tensioner. The original tensioner just didn't get the job done after the engines got a few miles on them, getting rather rattly. Honda came out with an updated tensioner in 1990, unfortunately after they put mine together. I put the updated tensioner in mine years ago and it has been fine since then. It's been an awesome bike. I'm leaving on a 6000 mile trip on it the end of July.