I cannot for the life of me find the year of my motor. The tag is clearly visible and says 105HP. However, the cover says 100. I don't know if that normal. It used to pur like a kitten but after sitting for about 5 yrs it doesn't want to fire up. I replaced all the plugs, replaced all fuel lines, cleaned the carbs and the fuel filter. It acts like it wants to turn over but doesn't quite get there. Any help with this is greatly appreciated.