I'm on 68/70mmpr with most motors. Went to Barley Mow and asked Mark Jewitt if I should drop a pinion for the smaller track then TRCC and he said just leave it as is. He was right.
At the recent National at TRCC I ran a Vampire 13.5 and this needed 2 teeth more on the pinion for the same size foams with the motor nearly on full timing.
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