Sounds to me like the battery is to weak to spin the motor fast enough to get past the next 300 degrees of crank rotate after the cylinders fire. Try a jump from a car battery CAR NOT RUNNING! to see if I'm correct.
Other wise I would say the ECU might have taken a crap and is not telling the plugs or injectors to fire.
You did not clean and over oil the air filter in the last few day did you? Cause that can cause this also.
The back cylinder on most air cooled motors also runs a bit rich to help cool it. Just a heads up cause you mentioned the plugs being different.
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