Is it a motor knock or a clutch/driveline knock?
First thing you need to do is double check the screws on the choke plate.
Is the engine oil level ok?
Where does the hydraulic pump get its power from? Can you disconnected the pump? Does your Cub still make the noise?
Remove the spark plug check it. Was the spark plug tight? What brand spark plug?
If the noise is still there I would remove the head and check for a blown head gasket.
Check the cumbustion chamber-surface of the piston and head for any damage.
Let us know if you find anything.
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