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the very first 600SS came with a 2.28 to 1 primary drive and had a 15T front sprocket and a 36T rear sprocket
During 1994 they changed the primary drive to a 2 to 1 ratio a change of 14%
as such the final drive gearing need changing to compensate so the rear sprocket was also altered by 14%
Knowing which one you have is the key
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