First, you should not mix your fuel and oil in the bike's tank. Mix it in a separate container and shake it well before filling your tank. If you put oil in, even with gasoline in the tank the oil will not mix well and will fill you carburetor and the engine can't run on oil alone. Always mix the fuel before putting it in your bike tank.
I suspect your spark plug boot is a big part of your problem. When you changed to the new plug you got a good electrical connection but because of the poor design of the kit plug boot it is easy for the wire to disconnect inside it or not make a good connection.
Engine vibration alone is enough to break the contact between your plug wire and the spark plug. This is why I highly suggested that you replace the kit boot. In an earlier post I told you that automotive plug boots will require the top cap be installed. The metal piece, contact in the boot will need to be connected properly to your wire. Some have a sharp pointed protrusion that will pierce the insulation and go into the wire when it is crimped on. I'm a little anal about that and I solder that connection before putting the rubber boot portion on the metal contact.
Get rid of that kit spark plkug boot. I feel it is causing you most of your problems.
Tom
