Ethanol of any concentration damages your motorcycle. But not specifally your motor.
E10 (now the norm in Europe) will do damage to your carb, tank and fuel hoses. It damages sealing rings in fuel pumps, o-rings in carbs. And will make a real mess if you leave it for many months.
E25 is even worse and can do actual damage to your fuel lines in short time. It's poison to an older bike. But it can be tollerated if you're just passing through a country etc. I doubt you'd do any lasting damage over a few weeks. But it's NOT for everyday use. And do not leave that stuff sitting in your AT in storage or over winter.
Honestly, with a 35 year bike, you should be replacing your fuel lines anyway. For more modern high quality hoses which are more resistant to ethanol that the ones Honda were using in the 80s and 90s.
If yours are the original, they will be perished and brittle and waiting for the worst time possbile to split anyway. Even if they appear okay.
Octane has nothing to do with the E rating of fuels. Luckily the AT has a low compression engine and it tollerates very low octaine fuels.
It's the ethanol which is the bad stuff. You will get E5 or even zero Ethanol fuels in major European towns and cities. You should use that whenever you can.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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