The worst motorcycle I ever owned was a first-year TX750. It was even listed as one of the 10 worst motorcycles ever made by one of the major bike magazines in the '80's. I wasn't surprised. Most of the problems were fixed by the next year, but a lot of those fixes could not be retrofitted to the first-year motors, like the adjustable counter-balancer chain tensioner. Yamaha replaced hundreds, if not thousands, of those early motors under warranty...