Hartog riding style very different. Thanks Rob.
Maybe it would be interesting, found T. Harada TZ-M 1993 championship engine chart: head volumes 8,2cc from first to last 14 round, but fuel from 5 to 11 round ELF 130 ( all fast tracks). ELF 124 from 1 to 3 round and last part from 12 to 14
Add Yamaha OWH1 rotary valve engine pic, angle 60 and looks like firing is at the same time in both cylinders.
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