This part is compatible with the following machines:
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- Billy Goat HW651SP TRACTION ASSEMBLY
- Billy Goat HW651HSP TRACTION ASSEMBLY
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.