invigiator wrote:Cool, if you can recreate it then let me know, I'd love to have that effect going on.

No problem. Just get yourself a sticking float or carb full of s***. When it ignites all the unburnt fuel "Hey Presto". A bang complete with flame!!!
With the possibility of literally blowing the carbs off or blowing your crank seals it would not be an effect I would be seeking on my 2 strokes.