I see where it is recommended to change spark plugs at 28,000 miles in the 1300 engine. I know in my Goldwings it said about the same but I ran them 50,000 miles and the plugs still look good. Do most people on here change their's at 28,000 miles? I have order plugs, HCM transmission filter and a set of front and rear brake pads which I plan to change around the 28,000 miles. I have changed the air filter to a K&N filter at 19,900 miles.