This is the HP & Torque curve of the stock 1994 YZF600R. So far the only engine upgrade has been a full Vance&Hines exhaust system. Front stainles-steel braided brake lines have improved brake feel tremendously. The stock tires were due for a change at 8000 miles..., and replacing them with Dunlop D207 made the bike feel like new. At the same time the forks were lowered 10mm, and needless to say, the handling improved tremendously. I could hardly believe it was the same bike.