Hi Deejay, thanks for clarifying the terminology and I certainly don't want to stuff the machine up by adjusting the wrong things. That said, I am not a complete nube with regards to motors and chain driven equipment so I had a reasonable suspicion that the cutter clutch is the issue...hence the post. I will run the mower again tomorrow and report back. Thanks for all your help as I am a complete nube when it comes to the cylinder mowers.