Yoopermike
ArboristSite Guru
A saw running 50:1 runs cooler than a saw running 40:1 as the fuel itself helps cool the saw.
You're going to get all sorts of opinions on the matter.
End of the day, as long as you're using quality mix and not letting it sit around for ages, I think you're fine with either 40 or 50 to 1. I personally use 40 to 1 in everything simply because its easier to remember for all of my saws and equipment, and its one of those cases where its just "worked for me" always.
I'm far from an expert, but my educated guess would be 2-stroke oil has more [BTUs]... however all the tests/reports seem to attribute the increase in HP to better ring seal and thus higher compression. I would also believe more oil would increase the octane of gasoline (i.e., harder to ignite oil than fuel), but that's likely insignificant.
Castor bean oil is still sold, like Maxima 927. Some old timers and racers swear by it. My understanding is it had/has some better lubrication properties, but they come at a cost... separation from fuel and deposit control. Now how does it compare to today's semi-synthetic and synthetic oils from a lubrication stand-point.... I don't know. Newer oils defiantly have better deposit control and less likely to separate.
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