![]() power and plot this again how often you're happy to change pistons. The karting guys will have a world of knowledge out there as there are far more still in use today than motorcycles but from memory you will need to build up your own histograms for EGT vs. For GP125/250's this meant running as lean as possible often to the point of replacing the pistons after a qualifying session or race as an example with power numbers ranging from 80bhp for a test session to 120bhp for quali. To tune this correctly we monitored EGT, knock with a det counter and frequently inspected the piston crown/spark plugs but didn't use an O2 sensor due to the high 'valve' overlap and oil content killing sensors very frequently. Without digging through old text books and track notes i couldn't really give firm parameters to work to but I can say AFR on a 2 stroke does indeed have a big effect on power.
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