thats interesting - in a stock bike designed to run 87 putting 93 in the tank will make it run lean - as in burn holes thru your pistons lean
what do your plugs look like when you change them?
have your re-tuned the bike to run richer?
the other consideration is hi octane gas has lower energy density than regular
you will get fewer miles per gallon running premium than regular, there is no way around that. If you do not have a hi compression engine that needs premium, you are paying more for the fuel and getting less miles per tank.
Thanks KCW. Guys on Stryker forum said that running premium gas helped with performance, but like Les said I've tried all octane grades and didn't feel any difference, just thought that higher octane gas burns at higher temperature and helps to reduce internal buildup. Plugs actually looked a bit lean, but not terribly lean. They were light yellow to white color, but no ash color. I gotta find a picture of the plugs that I used to have. I re-tuned the bike when changed the exhaust and intake using EJK fuel controller and was checking plugs to make sure all was good and it seemed to be.
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Wife: 2018 Sportster Forty Eight Special
Me: 2019 Road King Special