When I bought my 85 Kawasaki ZN700, it only had 1,053 miles on it. The oe had passed and his nephew tried to clean the carbs and get it running. It was running ragged on 3 cylinders when I bought it. Turned out to be a completely dead plug. I'm sure they were the original 24 year old plugs but they were low miles! Ha! A bottle of Valvoline complete Fuel system cleaner in a tank of gas and new plugs and it runs like a champ.