Length excluding thread: 73 mm

clutch and transmission are combined and use the same oil

39-83 Big Twin & 45" SV

for no good reason

arlen ness stage 1 big sucker round air cleaner for harley BS90 Length excluding thread: 73 mmOne piece aluminum backing plate For use with the OEM round air cleaner cover Stage 1 red pre oiled filter element. With added urethane for best support of the factory cover. The best and simplest performance air cleaner kit for your bike period. Increases Horsepower & Torque Patented Hidden Breather Technology Pre Oiled & Synthetic High Performance Filters One Piece Aluminum Backing Plate Radius Air Inlet for Unobstructed Airflow Note: See 960971 for