If your motorcycle without theft coverage was stolen out of a neighbor's garage will their homeowners insurance cover it?
No, Your neighbor has a home insurance policy to cover his owned property. Homeowners insurance is specific to the named insured and the insured's scheduled property.
Homeowners Insurance does not cover automobiles or motorcycles at all and does not cover property belonging to third parties except in very narrow circumstances.
Personal Property coverage excludes motorized vehicles except lawnmowers, golf carts, off-road ATVs, vehicles for the handicapped. If it is a vehicle intended to be licensed for road use, it is excluded under residential building policies.