Sounds like the primary chain adjuster has slipped loose or something. I'd pull the primary cover off and take a look to see if I saw anything that didn't look right. Just drain the primary by removing the drain plug on the underside back where the clutch is. Remove the floorboard and the bolts and take the outer primary cover off. You can see the whole setup then. The chain should have 3/4 to 7/8 inch freeplay in the middle.
Good Luck
Steve
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