Typically 87 octane is fine. 80's bikes may want 89.
I second that. The '08 750 gets along just fine with 87.
'14 HD street bob, 103ci/ 6spd, DK custom intake, Power vision2 tuner, Bassani 2-1 road rage, steering damper, Daymaker LED headlight, cafe fairing, + more!
'08 aero 750, jetted, Uni air filter, holesaw mod, 170 rear, still in the family.
'00 Silverado 2500, supercharged 6.0L, 10in of lift, Cognito UCA's, 35in mickey thompson's, 2012in wheels, 4.88 gears, MSD iginton, K&N filter, headers, true duals, 6000K HID's.