AIR UP THE TIRES Costs nothing, but can make a huge difference in the way a bike rides.
TOP OFF THE OIL If you see a bike with low oil, it's an instant pass—who knows how bad that engine is?
GET THE PAPERWORK Be sure you have the current registration and a blank bill of sale from your local motor vehicle department. And, finally, always fill out a transfer of ownership/liability form. Doing so will protect you from legal consequences if the buyer gets in a wreck 10 minutes after you sell the bike.