I have a 1986 Evin 25 that was never opened until now (still in the packing crate). The plugs look brand new. Via email, a dealer told me that the fuel lines won't take today's fuel, and that the engines were always run at the factory so I should have them take apart and clean the carb because of gumming - I think I'll change the fuel lines and run it before deciding the carb needs cleaning. Again, the plugs look untouched. Please give me your advise.<br />Thanks