Oil ratio and how often you tune

[Chris-PA]

I mostly have to tune for temperature changes. I'm at about 700'. Some saws just seem to need it more than others. I cannot stand it if the saws are running too rich so I keep them closer to the edge than some do.

 

[ft. churchill]

I run 32:1 ratio synthetic oil in all my saws, and I live and tune at 4300' elevation. I cut at 8000' elevation and usually do not re-tune. They just run richer at higher elevation. I've never fouled a plug either.

 

[erikvr]

Adding more oil leans up the mixture as the % of fuel decreases. So you have to richen more as a result of adding oil . I think the only result is more smoke.

 

[Brushwacker]

Has anybody noticed that running a higher oil ratio has led to the saw being more susceptible to environmental conditions? I feel I tweak more frequently and when there is a large swing in temp I've had saws that needed large adjustments. I run a modest 40:1 stihl silver. Before I ran 50:1 dyno cheap stuff.

I'd attribute some to being more familiar with saws, but I've had to make much larger adjustments since switching.

I run 28-1 and its not uncommon for my carbs to need tweaked to keep them running ideal from day to week most generally. Seldom 1/8 of a turn or more, usually half that. I keep a screwdriver handy when on the job.
I wouldn't be surprised if richer oil mixtures are more sensitive to temp changes.

 

[Brushwacker]

Adding more oil leans up the mixture as the % of fuel decreases. So you have to richen more as a result of adding oil . I think the only result is more smoke.

And I think you also get less friction, cooler running, more power and extra engine life when it coincides with proper tuning and routine maintnence.