While VINData and CycleVIN are great resources, they both charge for their reports, which can be costly if you are trying to compare multiple bikes. There are also sites like VinFreecheck.com, which allows you to find a motorcycle both through VIN and US license plate.
VinFreecheck will generate a report with some content immediately viewable and some behind a paywall. If you so choose, you can pay to unlock the entire NVMTIS approved report. Free content includes some vehicle specifications, some non-title related checks such as a junk or rebuilt record, some title related checks such as insurance loss record, number of accident records, number of odometer records, and a partial history of title records. This can be a great resource for a cursory check of a motorcycle you are considering to see if it has a junk record or a number of past accidents.
Another free resource is VINPIT.com, which has a specific motorcycle section. The report details stated on its website include number of owners, any outstanding dues, history of theft, odometer rollbacks, state agency brands, insurance claims, market value, and recalls/warranties.
It also includes a Frequently Asked Questions section with recall records, accident records, engine type, and auction records. VINPIT also links to Bumper, another paid vehicle report service, if you would like more detail. However, there may not be much information on motorcycles in the Bumper database.
Exercise caution when using free reports, as they may not be complete or accurate. Remember, you get what you pay for. That being said, a free partial report can be a great first step in comparing motorcycles and deciding which ones to pursue further.