Sprocket shaft does not have keyway.
Use 23902-81 nut (MCS 923902) on flywheel side.
JIMS shafts are precision machined in Camarillo, California from a special order steel.
Each and every part is thoroughly inspected and after heat treating all threads go through a special process to make them withstand greater torque stress.
All shafts are ground to a 16 micron finish or better, unless otherwise specified.
All ground diameters are concentric to well within .0003″, making truing and rebuilding quicker and with less effort.
Fits:> L81-85 XL (NU)
