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On the 790 didn't the BA have a lower limit than the SM? I think I remember like a 500rpm difference.
All 790's, 360° & 270° are set to 7,400rpm, having said that I have seen a couple of odd early America igniters set to 7,500rpm as standard.
Some of the early America igniters are the ones which cut out after touching the rev limiter and won't fire correctly again until the revs come down to around 5.5-6k, the cure to this is to raise the limit so you very rarely touch it.
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