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Goofaroo wrote: 07:50 am Dec 05 2020 You will get a slight power increase simply because the 87 octane is more volatile than 92 but the real advantage is that it will burn cleaner. You’ll get less carbon buildup in your combustion chamber and less pollution spewed into the environment. Not to mention the benefits of straight gas vs ethanol. Synthetic oil at 50:1 will also create a cleaner burn. I have run that combo for a few decades in my saws, trimmers, and bikes with perfect results.

I do motorcycle and small engine repair in my backyard shop and routinely see what too much oil and high octane fuel will do to combustion chambers and spark arrestors.
Save yourself some money and do your bike a favor and run the appropriate fuel and the right amount of oil.

MoonStomper wrote: 08:21 am Dec 05 2020

Goofaroo wrote: 07:50 am Dec 05 2020 You will get a slight power increase simply because the 87 octane is more volatile than 92 but the real advantage is that it will burn cleaner. You’ll get less carbon buildup in your combustion chamber and less pollution spewed into the environment. Not to mention the benefits of straight gas vs ethanol. Synthetic oil at 50:1 will also create a cleaner burn. I have run that combo for a few decades in my saws, trimmers, and bikes with perfect results.

I do motorcycle and small engine repair in my backyard shop and routinely see what too much oil and high octane fuel will do to combustion chambers and spark arrestors.
Save yourself some money and do your bike a favor and run the appropriate fuel and the right amount of oil.

Goofaroo... based on your experience: in order to simplify my life, is there any harm in running my Husqvarna 346XP chainsaw (manual calls for 50:1), my son’s KTM 144 SX (40:1), and my KDX (32:1) all on the same gas; 90 octane non-E @ 50:1? How would you expect it to affect their performance if it doesn’t harm the engines? I’ve been running the bikes on non-E 90 @ 40:1 and the saw on non-E 87 @ 50:1. Thanks!

Goat wrote: 11:11 pm Dec 05 2020 Higher octane does not make gas less explosive. It raises ignition temp. Very much needed for higher compressions so that it ignites from engine spark and not engine heat.
I would never run 87 in an engine with higher compression or even average compression with heavily advanced timing.
I just do not know if an 8:1 kdx w/ stock timing needs the higher octane. My hipo cars will never see 87 gas.
The normal train of thought is to run non-ethanol gas if you can. But never at the risk of predetonation.
And food for the other thought:
More 2T oil generally increases ring seal and as rule of thumb produces more power than less oil mix. If you don’t mind the smoke.
More oil typically produces more power since higher compression is more of a power producer than the better efficiency of real vs E10 gas. But you will see a loss in mpg. The given is that it takes more E10 gas to do the same work as real gas, not necessarily that E10 can’t perform the same work.
But I do fully agree there is a limit to how much smoke you want to put up with. Along with too many mc’s, I have 4 chainsaws for different jobs. My saw shop recommends 32:1 vs 40 or 50 for power & longevity of the motor.
Don’t mean to start flame. But don’t think a 50:1 mix produces more power than a 32 or even 26 mix.