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There are many 250cc 4 cylinder 4 strokes from the late 1980's that rev around 20 000rpm with a waste fire system as the trigger is on the crank. The rev limit is not about the cdi technical limits, simply an industry standard agreed between Yamaha, Suzuki, Kawasaki, Honda to regulate power...

i agree with Cogsy, i had tested a homemade hall circuit, waste fire ignition the other day on a 4 cylinder dummy crank (turned by an electric motor for testing) and it started doing strange things past 40 000 rpm (forty thousand rpm) plus ... please dont try rev that high Michael... Nice Build...