M-Tronic/Autotune & Oil Ratio Change?

[RED-85-Z51]

No one is being a closet scientist. Saws ran for years on specified 40:1, 32:1 ratios. When 50:1 became specified, most people associated that change was influenced by emissions standards. It's not unreasonable to assume that it's compromising the wear/longevity of the saw. In reality, 50:1 might have been acceptable all along. Before emissions standards changed, there was no need to test it.
How and why is octane so critical? Saws have low compression ratios and don't have the risk of detonation as much as other engines.

Saw oil tech has also changed...we don't run castor oil anymore haha

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[stihl86]

No one is being a closet scientist. Saws ran for years on specified 40:1, 32:1 ratios. When 50:1 became specified, most people associated that change was influenced by emissions standards. It's not unreasonable to assume that it's compromising the wear/longevity of the saw. In reality, 50:1 might have been acceptable all along. Before emissions standards changed, there was no need to test it.
How and why is octane so critical? Saws have low compression ratios and don't have the risk of detonation as much as other engines.

We will have to disagree on octane. On the entire subject in fact.

 

[banditt007]

Most saw manufacturers I've seen recommend 89+ octane (RON+MON/2)