I have a Warner Mag-Stop clutch on a 25hp Kohler. I was mowing today and started smelling something funny. I shut the mower off and checked the fan shroud to see if it was clogged, and all good to go. So I started again andwent about 100 ft without the blades engaged and all the sudden a puff of smoke came from the engine area. I shut down the engine and looked around. The bearings inside the clutch had melted and some shot out of the housing. I started using doubles this year, but was not using them when it happened. As directed by my owners manual I engage the blades at full throttle. Any help/suggestions will be greatly appreciated. By the way it is still under warranty.