Any modern day motorcycle is designed for 10% ethanol which is not corrosive at that mix, it’s the phase separation after storage without using fuel stabilizers as we’ve discussed that’s the issue, that’s now 100% ethanol + water sitting at the bottom of the fuel tank ready to wreak havoc. If one doesn’t ride often enough to burn an entire tank of gas every 1-3 months depending on humidity, use fuel stabilizer. I’d say up to 30% is dry, 60% is normal, and above 60% is humid, which is often the case when it’s cold outside.
I do find that some carburetors don’t like E10 however. Fuel injected motorcycles are fine.