The large gear sits over the rivets on the flywheel. It can be gently pried off. A long as both bikes use a 2K3 ignition/flywheel, you should be fine.
You may need to make a thick igntion cover gasket to space out the flywheel cover to assist in correcting the gear mesh. Crankshaft spacing can vary enough that different methods of correcting the alignment are needed.
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2011 EC250E
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