I'm in Portland,Oregon,U.S.A if that helps anything. the spark is strong. i understand that hemispherical compression plays a role in the spark's strength. the density of the air and fuel under compression can inhibit the ability for the spark to ignite the fuel. I have taken the carb off, drained it and peddled around for a while draining any flooding that could have happened in the cylinder, then made sure the exhaust was empty and dry (short of a lighter to burn off any remaining oil and fuel.) I don't know what's wrong with this engine.