Hi - I want to run my engine in right. It is an OS46FX. I know I am meant to run the engine REALLY rich by getting it to 4 stroke and then leaning it slightly so it 2 strokes again.

My problem is that I am not sure I am picking up when it is 4 stroking. I have read that it should be growling and deeper etc but I could not detect a change no matter how rich I went. The engine would just stall without 'growling' imho.

Could someone email me a audio files (mp3, wav, whatever) of a 2 stroke engine that is 2 stroking, and is then 4 stroking please?

Hope someone could help