I´m trying to bring ´83 Shadow VT500C back to life. The bike only has 5500 miles!. It´s been sitting in the backyard for 10 years. I cleanned everything the best I can: Gas tank -carburators - changed the oil & filter - changed air filter - flushed the radiator - sparks tested OK (which brings this question:what kind of tool to remove the one plug that facing the radiator?) - can only change 1 plug so far. I managed to crank the engine; I sprayed some of those \