Join Date: Nov 2018
Location: Texas Hill Country (1hr NW of San Antonio)
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Just to be clear, you are hearing the CLUNK as you are letting the clutch out to leave a stop? If so, here are some thoughts:
Check your rear sprocket nuts to be sure they are all tight. If they are coming loose (or some missing) you'll get a clunk
If not that, then check your counter-shaft sprocket nut. If it has 'play' in it, you'll get a clunk as you release the clutch.
How many miles on that chain? If it is 9,000 or more...could be the chain even if it 'seems' good.
If it isn't any of that...then the potential problems get more expensive (transmission?) Let's hope for a 'simple' fix first.