Bill of Sale ; Library File Link. Create a motorcycle bill of sale form for Arizona to document the details of your transaction and prove motorcycle ownership.The motor vehicle seller must insert the sales price, nonresident state and Arizona county tax rates and complete all mathematical calculations. An Arizona motor vehicle bill of sale is part of the vehicle registration process. You can use our free template to create your document. The buyer takes the full ownership of the Vehicle (Make, Registration Number). bearing. A purchase agreement letter between seller and buyer is created when two parties come together, where one party desires to purchase a piece of property. This document summarizes a motorcycle sale agreement between a seller and buyer.