Yes, you can easily be scammed - as you're selling an item that cannot be shipped and tracked (it's a challenge to mail a motorcycle), allowing the buyer pick-up the bike in person voids your Seller Protecton and the buyer has voided his Buyer Protection as vehicles, including, but not limited to, motor vehicles, motorcycles, caravans, aircraft and boats are Ineligible items under PayPal’s Purchase Protection program. The buyer can ride home, file an unauthorized transaction report and possibly get his money back. Deals such as this are best handled local and for "cash".
