It should run better on 87 octane than on premium. Octane is put in gas to retard combustion which is necessary on high compression engines otherwise it pre-detonates. For low compression (such as the Bonny America), 87 octane burns better and the octane is actually a negative. The only plus to burning premium is that some companies put better additive packages in the gas... such as cleaners but if a bike is designed to run on regular 87 octane, your plugs will stay cleaner and the engine will burn cleaner on regular.
