My dyno trace dies a death at 12000ish anyway, the change there is one needle clip, it was a little better when I went a size leaner but then it seized up in the cold, you play with fire........

I've never seen one rev up to 13000 really anyway, the rev counter may say so but it lies.

See all the ones from the 1st dyno day here - not one making power past 12000

Even the Apex/Frank Wrathall 74 bhp monster makes peak power about 11000 and is dead by 12.
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