Need the model number off the engine.
Although I'm NOT positive, I would say his engine is a model # ( 3TG66UJ ) ..?? ..:wink:
Found a used muffler from a DIESEL, ... I don't know if it's interchangeable with the gas engine model though, maybe a little modification, ...??? check it out !
https://www.ebay.ie/itm/3-Used-MUFF...810984?hash=item3f905ad2e8:g:XpoAAOSwezVWu1C4
Is this the muffler you need?
https://www.hoyetractor.com/PROD/M802472.htm