[PAB_OH]

It's probably just diesel knock but that is a diagnosis from xxx miles away without listening to the machine. Take it for what it's worth.

I have noticed the Daedong engines are MUCH louder than some others. My previous tractor was a Kubota and it purred once it warmed up. The 'ol Kioti definitely make more of a racket. I don't mind it really but I was surprised at first.