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Ttt

Nope not playing. This mower has cranked no problem for probably 15 years. After sitting all winter. This year fires it up, would only run on full choke. Cleaned carb and it ran but not right. Purchased new car, installed and crap loud. Bought new muffler, no change. I messed around with mixture...

I'll try that. But still don't understand why oem new muffler and still loud and chokes down with ether

Power built 12.5 hp

It also chokes down when you spray starting fluid in carb. Found out spraying for leaks.

I have a briggs powerbuilt 12.5hp. And it has got extremely loud (exhaust). I replaced and still the same. Covered muffler with rag to be sure it was from muffler. Could it be a burnt valve or what am I missing?