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What elevation are you riding at. Been using 91 non-ethanol for 20 years here.
Been running +2 on both of my 19 sleds this year, no issues. 91 non-oxy 5000-8500 feet. I ride 4+ miles across the lake most every ride at speed (5000 feet), no issues. Noticeable snap in the midrange that wasn't as strong before the timing advance.
Key? Or re flash?
Ace