At least 87. I run 93.
No, all later model Harleys run on low octane fuel.
93 octane premium fuel. You just spent 10-40k on a motorcycle, treat it as such...
91 octane is required on all Harley Davidson's.
91 octane
93 octane
with an octane mesurer
premium grade (92 octane or better) for all Harley's
That doesn't seem to be a question.
87 octane
87 octane
It will run on just about any gasoline 87 octane or higher, but considering the gas mileage motorcycles get it's crazy to try and pinch pennies when it comes to fuel quality. I recommend using the highest octane pump gas available. The higher the octane, the less likely you'll experience preignition or spark knock, especially in warmer climates.
it is based on Octane levels, you have your standard 89,91,93 octane regular gas, and racing fuel is closer to 117 octane hope that helps