Andy wrote:Why would it "lean out" and seize? Unless of course it had been fiddled with!

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I'm not saying he fiddled with anything. It could have been wrong to begin with. A 2-stroke can lean out and seize just due to a change in weather or altitude; not to mention a leaking seal. I was working with a team at Hockenheim Ring many years ago and we kept seizing motors everytime the bike entered the forsest section on the GP course. It wasn't till the third try that we changed to a larger main jet. We don't know if the track was just cooler there, or there was extra oxygen due to the trees.
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