to slow down my blade tip speed enough to notice. I have noticed this year that even with high lifts (singles) I have recut the same area 2 and today 3 times to get it to look good. This didn't used to be the case. Before I go calling my dealer who will want to replace both gaskets and the muffler I thought I would ask here. Thanks, It's a 52" GDane Surfer w/ a 22hp Kohler air cooled.