Those of you thinking fuel issue, or cam timing I think miss one crucial fact. His video is with no load on it.

I cannot imagine a fueling issue that would cause it to do this unless it was massively rich and it'd be blowing great clouds of black smoke.

I cannot imagine a cam timing issue that would let it run at all and do this.

It almost has to be ignition.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.