Chainsaw Repair

I'm not so certain if one could  actually determine by sound if in fact it were firing exactly every other cycle .It appears to but that might not be the entire story of what is happening .

A richer mixture of fuel and air burns at a slower rate than a leaner mixture ,a long established fact .Fact it's one of the basics  of tuning by ear. Now perhaps if saws were electronically controlled  with fuel injectors,knock sensors and variable ignition timing like modern automobiles this age old method would not apply.Weather that will ever happen in the future remains to be seen .

Now along comes the diaphragm carb.,basically the standard for the last 50 some years .A mechanical wonderment which is really a hybrid of a carb and a mechanical fuel injector but it's not perfect .It cannot perfectly respond to varied RPMs in relationship to engine loading so tuning of same goes back to the old adage"when in doubt error on the rich side ".