I'm going to assume that you are talking about how to remove the engine sprocket from the sprocket shaft in the primary cover.
First, disconnect the battery and drain the primary. Look underneath the primary and loosen the locknut for the primary chain adjuster and loosen the primary chain by turning the screw outwards a few turns.
Then take the derby cover off the primary and remove the spring and locknut for the clutch adjustment. Remove the screws from around the primary and break it loose from the engine. Turn the clutch adjustment screw clockwise while removing the primary cover. Lay the primary cover aside.
Now, there is a plate in the center of the clutch assembly held in with a circlip. Remove the circlip. Now you'll need either an air wrench or a locking bar to lock the primary to prevent it from turning so you can get the clutch hub nut and the engine sprocket nut off. The engine nut has right hand threads and comes off normally. The clutch hub nut has LEFT HANDED THREADS and you must turn it in reverse. Once you get the two nuts off, you can usually grab the engine sprocket and the clutch assembly and lift those two units and the chain off at once. Sometimes you may need a puller to get the engine sprocket off but usually it just comes right off.
Installation is the reverse with the engine nut being torques to 150 foot pounds and the clutch hub nut torqued to 60 foot pounds left handed.
Good Luck
Steve
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