If your drive chain is making a popping / clicking noise or sounds like it is binding when it runs, not running as quiet as it once did , the chain is worn/stretched beyond it's service limit and ready to fail. Order replacements now to have on hand for the inevitable.
Please measure and verify the actual # of links or the overall length of your drive chain before ordering.
If the chain you need is longer or shorter, contact us, we will make one especially for your needs.
Don't forget about your transaxle reduction chain.