Kubota L2900 engine knock?

I have three Kubotas and the closest sound I've heard like that was when the water pump was going bad. It also could be a valve adjustment needed.
Are you saying this is a new sound? I have 3 compact Kubotas (1988,1992 and 2015). I don't hear anything concerning.

You certainly can do what you want, but as I said, mine sound the same and have for a long time. My new one makes a little less noise, but it is 30+ years newer.

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