Tuning with tachometer

[rxe]

It sounds like a flubbing noise or burbling,

 

You know how a normal 2 stroke goes "whhhhheeeeeeeeeee", and sounds like it has real power? 4 stroking introduces a "blubber" so "wheeee-ba-ba-ba". Set the saw really rich if you want to hear it clearly.

 

Quite a lot of the time when a saw blows up the user says "it was sounding really great and cutting really well, then it stopped and I couldn't start it again" - of course, because it was probably turning 2K rpm faster than it should and screaming like a banshee - just before it melted!

 

Oh, and never tune it without the bar and chain on. It will spin up far too fast.