I recently had a severe waterpump failure on a 4 day riding trip. I noticed the bike having issues with idling and the kick start lever feeling lighter each day. On the last day, it melted out the headgasket and what little coolant was still circulating through the bike was sent out the tail pipe in a cloud of steam. I almost got back to camp before it seized. The sparkplug was covered in aluminum glitter and was smashed flat from being hydraulically shocked. The transmission was completely filled with coolant when I got it home and tore it down. Nothing came out of the drain bolt on the waterpump cover when I went to drain it. My wrist pin looked a lot like that.
I can't believe 2 strokes used to be air cooled.
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