Yea you can run just regular 10W30 or 10W40 or 20W50 4 stroke oil. You cant just get any oil. It has to be made for atv's/motorcycles that have wet clutches.
You can also run Automatic Transmission Fluid Type F.
I usually run an oil that is designed for 2 stroke transmissions. Bel Ray Gear Saver, Silkolen sp? Comp Gear, Honda HP 80w.