fonty,

Thanks, that all makes sense. My motor is mostly stock; H2 cylinders, KV3H heads, 010 card, no air box - pod filters, 170/175 mains, 40 AJ. It seems to runs pretty well as set up but I have always thought it was a bit rich. I try to run 100 unleaded/premix in it most of the time but have to resort to 92 when I am on the road. I think the 100 helps with the advance of the 010 card. I'd love to get an 030 card but they don't seem to be available anymore.
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Andre E. Benguerel
1996 Honda NSR250R
Daijiro Kato/Fortuna Replica #74

2000 Honda RS250R (NX5)
2008 Honda RS250R (NXA)
AFM Expert #430