I have a 2001 Hayabusa with about 25000 miles on it. To problems, Im getting lousy gas mileage. About hundred miles to a full tank of easy highway riding. Also i think im hearing valve noise, wanted know if their is a timing adjustment or the only fix is adjusting the valves. Is it a big task to do it yourself if you have some mechanical skills. Also is there an adjustent with the cam chain tensioner.