When it comes to 2 cycle equipment that I have use I have notice that the fuel oils have come a long way since I was a kid. When I start using chainsaw about 40+ years they ran on 16:1 mix and now days it is come the run at 50:1.
Some the older saw actual used SAE30 weight motor oil in the fuel. Now with the synthetic oils those older saws that ran 16:1 are now running just fine at 50:1 mix ratio. A third of what I used 40+ yrs ago. I would not put to a test by trying at 100:1 on equipment that has today's spec of 50:1 but that may just me being overly cautious with my customer's equipment. It would take some nerves for me to try it even on my own equipment.
I just don't like tearing up good equipment just to experiment but I do have what I consider throwaways that I could experiment on and might try this Fall. Easy enough to mix at 100:1 as I buy the 1 gallon mix packages so I could put one pack into two gallons. 2.6 US ounces (5 tablespoons + 1 teaspoon) to 2 US gallons would 100:1. I actually use 5+2 as some oil always sticks to the measuring spoons or just used a premeasured package.
I have however seen where customer accidentally ran a 80:1 mix in his Stihl FS90 trimmer and it cooked the PNC the first day. He tried blaming it on me as I just installed a new carburetor on the trimmer but I knew it was properly tuned and had left the shop with the correct fuel mix. I empty his mix in one clear jar and put my 50:1 in another same jar. It stood out like a sore thumb that he had the wrong mix. Now of course Stihl always run rich on the fuel mixture so should have not cause it so quickly. I kinda suspected he straight fueled it and simply dump his mix in later trying to cover his skin.
It kinda strange using the new ratios as I remember I was continuously burning up PNCs back when I was using chainsaws and I know I carefully mix the fuel. I did however cut several pickup loads of firewood per day for most my Summer school vacation to heat the home and to sell. I usually got a about a month on one set, Matter the dealer parts department was getting pissed at me for doing so even though I was paying the new parts at whatever they were asking for the parts.
