Once off you will see there are hex heads on the back of the sleeves (which are simply pressed into the sprocket) that the bolts are screwed into. The sleeves are not always a tight fit, so they will often spin unless held from behind.
Make sure you tap the sprocket around its edges evenly, so as to not jam it at an angle in the cush drive. It should come out pretty easily.
Have a look at the diagram in the Online Parts Manual of the assembly, and it should be apparent how it all comes apart.
Oh, and welcome to NSR-WORLD!
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Andy.
NSR-WORLD.COM
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