I get the basics of tuning a saw and I'm still learning, I have a new Ms391 just broken in I've been using it for milling small logs and plan to use my 3120xp for large ones. My question is can I slightly increase the high screw for a little extra 4-stroking at WOT W/O changing idle and L screw? Or do I need to go through the whole tuning procedure??
Also saw this in the owners manual:
Fine tuning for operation at high altitude
A slight correction of the setting may be necessary if engine does not run satisfactorily:
N Carry out the standard setting. N Warm up the engine.
N Turn high speed screw (H) slightly clockwise (leaner) – no further than stop.
NOTICE
After returning from high altitude, reset
Just out of curiosity less oxygen at higher altitude these adjustments are recommended to keep the saw from running overly rich?
Also saw this in the owners manual:
Fine tuning for operation at high altitude
A slight correction of the setting may be necessary if engine does not run satisfactorily:
N Carry out the standard setting. N Warm up the engine.
N Turn high speed screw (H) slightly clockwise (leaner) – no further than stop.
NOTICE
After returning from high altitude, reset
Just out of curiosity less oxygen at higher altitude these adjustments are recommended to keep the saw from running overly rich?