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Beyond that, the timing curves and the rev limits as well for the 790, 865 carburetted and 865 injected engines are completely different so as to match with the valve timing changes. Now, considering that, even with increased rev limits the 270 degree engine just won't run as fast as the 360, both coils must be firing at the same time and the lack of core saturation at high speed is killing the spark. They are probably using separate ignitor outputs because the unit is too small to contain drivers large enough to manage 2 coils.
The 270° igniters I have reprogrammed run to 8,500rpm with no problems.
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