For use in warming a rider on a motorcycle having a heat-producing engine, a portable heat transfer system and method of warmth. The system includes an air blower having an air inlet and an air outlet and being adapted to be positioned and secured preferably behind the engine in an area of heated air build-up beneath a rider seat where heat as a byproduct of engine operation accumulates. The air blower is connectable to an electric power source of the motorcycle to operate the air blower. An elongated flexible air transfer conduit is connectable at one end thereof to the air outlet of the air blower while an air outlet nozzle is connected to another end of the conduit. The outlet nozzle is adapted in size and shape to be inserted and held beneath a conventional upper torso garment worn by the rider whereby warmed air is drawn into the conduct from the area of heated air build-up by the air blower is discharged from the nozzle beneath the upper torso garment to warm the rider.