On 6/15/2017 11:07 AM, Gramps' shop wrote:
I,switched to the premixed fuel you get,in the can at the local Ace. My only beef is my weed whacker takes 50:1 and the chain saw takes 40:1. Fuel stays in the equipment for months and no problem starting.


Do a bit of research on it, Larry.

My small engine guy told me to go to 50:1 across the board, especially
if using the pre-mixed fuel or the 2-cycle oil specifically designed for
mixing.

Echo products says the same thing: Use 50:1 regardless of what our
owners manual says.

Hell, just using the non-ethanol, pre-mixed fuel is going to extend your
engine's longevity by itself.

Also found this with a bit of research.

"If you are using a modern 2-cycle oil designed for air cooled engines
and it says 50:1 on the bottle, then you can use it at that
concentration in your saws without worry. This is true even if the
owners manual for your older saws and OPE say something different like
40:1, 32:1, 20:1, etc. The properties of 2-cycle oils have improved
dramatically over the past couple decades..

The same modern oil at 40:1 is fine, too. As always, keep your OPE
properly tuned.

If you are using your saw for heavy duty activity like milling, higher
concentrations of oil will help to protect your engine."