I heard thru the grapevine, that the new Walker coming out in April with the 31 hp liquid cooled Kohler was clocked at the factory at 7 mph. The person I spoke with is checking to see if the speed up kit will get it to a respectable 8 mph. It is fine to have a mower that can go 15 mph, but realistically, I can only mow from 5 to 8 and get a quality cut. My Walker does 6, but in the dry summer I would like to go 8. Just thought I would pass it on to you guys, in case the speed factor was keeping you away from a great machine!