There are a number of reasons why Harley's aren't stolen as much as they use to. The #1 reason is that states have toughened the laws about titleing a vehicle and the security.
In the 90 systoms's and early 00's one could steal a late model Harley, buy a set of S&S crankcases, a Delkron transmission case and a aftermarket frame and put it all together.
Ditch the stock frame and cases. Go to the DMV with the bike and the MSO's for the frame and cases and they would hand you a title. About $3500 and you had a new clone with a custom paint job.
Now days you need to show a receipt for everything. The new Harleys have numbers on everything. The ECM can not be swapped around.
The custom bike market is for the most part dead. It just isn't worth stealing a bike anymore.

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