Why lean engines run hot

[Freddy]

Thought this an informative video, very relevant to an air cooled engine. Certainly supports my hope that now running larger main jets may avoid the damage I had to the pistons and cylinders 1 and 4 in the last rebuild. It had run stock jetting for most of its life, which I believe to be quite lean and 1 and 4 being especially so having one size smaller main jets than the middle two cylinders.

[andye]

The some interesting stuff on the Workshop, if you don't mind the swearing.