There is long-ago-deleted reddit AMA by a motorcycle thief who was never caught before retiring. The details he went through made me believe he was the real deal, even if not actually retired.
One of the things he stressed was all the ways people think motorcycles are stolen aren't they ways motorcycles are stolen, because those methods are used by would-be professional thieves who get caught. The professionals are the ones who don't get caught also don't use the same methods.
The thief mentioned replacing OEM ECUs with some sort of home-made jobber that was "good enough" to start the bike and ride it away--the actual way motorcycles are stolen--to a shielded transfer point, typically a delivery truck, where the buyer waits to collect and pay for the stolen bike.
One of the things he stressed was all the ways people think motorcycles are stolen aren't they ways motorcycles are stolen, because those methods are used by would-be professional thieves who get caught. The professionals are the ones who don't get caught also don't use the same methods.
The thief mentioned replacing OEM ECUs with some sort of home-made jobber that was "good enough" to start the bike and ride it away--the actual way motorcycles are stolen--to a shielded transfer point, typically a delivery truck, where the buyer waits to collect and pay for the stolen bike.