briggs valve stuck twice.
I have a troy bilt 33" mulching mower with a 8.5 briggs. My son was running it to fast in tall grass and killed the engine. It wouldn't start and I started looking and found the exhaust valve stuck. I removed it and found aluminum deposits on the valve stem. Removed them and put it back together. It ran fine for a while, then lost the spring retainer on the same valve. Is this engine shot since the aluminum valve stem bore is sloppy? Also wondering if installing a new Honda engine on a 10 year old troy bilt is worth a shot. My luck the transmission would shell out as soon as I did that.