I would say don’t do it. These engines are designed for the fully synthetic oil. By using a non synthetic oil you will have more wear on your cylinders and engine parts. Also by using an oil that is not recommended, you will probably void any warrantee you have on the bike.

"It's a hundred and six miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and we're wearing sunglasses."