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I went through all of this last year.
INFORMATION BULLETIN: Dellorto Ignition System -How to Assure Faultless Function
I had an issue that the engine stopped revving past 12500 after the upgrade. Turns out it needed a crank sensor gasket installed, so it doesn’t pick up as much noise from the crank.
Also, all of a sudden an engine stopped revving past 10000 during one of the races. Wiring harness (EVO v1) went bad.
I would try a crank sensor first. If you are determined to take an engine to your engine builder, may be get him your wiring harness as well