I have a 1983 Yamaha 900 Seca and would like to know how you would replace the bulb for the speedo and my other question is it seems to be bad on plugs on the inner right side something seems to kill that plug with in a day??? I just bought the bike and had to spend $1100 on it for a saftey so I haven,t had time to take anything apart yet so I,m looking for the easiest why??