The bearings run lean on oil in any strato. But the stoichiometric burn ratio on top of the piston still needs to be 14.6 parts of air to one part fuel for any gasoline internal combustion engine. If you look at the spark plug, the only ones that are a little bit lean are the MS 261 and the 462.
I’ve had 562s with 200 hours on 50:1 with stihl and husky oil come to me with bad bearings. New bearings, healthy port job adding 30 psi of compression, and Red Armor at 40:1 on 1 saw in particular from a tree company that now has over 1000 hours on it and still runs fine. I believe the original bearings weren’t the greatest, but the common denominator is that more oil is needed to make up for the efficiency of the strato design. If a saw runs longer on a tank of fuel, it’s doing the same amount of work on less oil as well. Combined with the inherently heavier strato piston, these new higher RPM saws need it for severe commercial duty
