From my experience with the 8v with K-Jet, the rotor button has a centrifugal spring operated cutout which shorts the ignition to cutout at set revs, and the fuel pump relay seemed to have an influence over rev limiting. I once did a dodgy temporary wiring job while waiting for a fuel pump and my 8v revved happily to 7 where before it cut at 6250. Could that go part way to explaining it?
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