What would that do? Higher octane gas than required will only make you lose power. If its not pinging or knocking, then dont change octane ratings..
Any specific rpm range that it pops??
Try hold steady rpm around 5-6k or so and see if it feels like its bucking and surging. If so then yes your probably lean. U might try turning the mixture screws out maybe a half turn or so. If that doesnt do it then your probably gonna have to get into the carbs and fiddle with jets and needles..
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