Hitchcocks Forum

My 2004, iron barrelled, Bullet Electra 350 has the rear topsides of both crankcase halves stamped with the numbers "500", just forward of the where the gearbox attaches.

Does anyone know the significance of this?
For example, is it a factory shop code, possibly to ensure the correct crankcase halves match after machining?

Thanks.

My Lightning has two sets of numbers. I've got 250 stamped on both sides at the front of the crankcases and 3761 at the rear.