Husqvarna yth21k46 Kohler sv610-3213

[skip6832]

Engine has a loud knock on startup then sounds normal after it gets up to speed does anyone have any ideas what could be causing this?

 

[bertsmobile1]

If it knocks when you turn the blades on & off check the engine mounting bolts

 

[ILENGINE]

If it knocks when you turn the blades on & off check the engine mounting bolts

And also when cranking to start or during the last couple of seconds when shut down.