Pre-Fishing friday for a tourney on Saturday and my buddies motor made metal grinding noise at take off after fishing half the day and 20 min boat ride to the lake that morning. Pull the cowl when we see and smell melted plastic. The plastic guard over the flywheel and belt is melted over the flywheel. After looking around the motor i find a washer at the bottom of the housing. Pull off the plastic guard and see the flywheel bolt missing and a very hot flywheel. finally find the bolt at the bottom/base of the block. After a little cooling time i turn the flywheel with my hand and you can here the magnets under the flywheel grinding and upon closer inspection i find little magnet fragments on the top of the motor. My Thoughts: did the bolt and washer work loose and bounce around and damage the magnets or did something else fault causing the flywheel area get hot and cause the flywheel nut to loosen? Any Ideas?