Broken belt
I've seen times when the belt takes weeks of shredding before it finally breaks.
The symptoms mimick a variatior problem. The acceleration is sluggish and it seems to creep at idle speed. This is caused by rubber build up in the centrifical clutch drum. The clutch engages early because of rubber build up. If the belt is badly shredded, remove the clutch drum and blow out debris, also blow out all the nooks and crannys. If chunks of the old belt are pocked up in the new belt it will have you scratching your head. Just a heads up!
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