Nigel,
According to the Rotax spec sheets, both the 912 and 912S show 4 deg.
BTDC to 1000 rpm, 26 deg BTDC above.
The 914 shows 4 deg BTDC to 900 rpm, 26 deg BTDC above.
Rotax recently announced that they were standardising the entire
ignition systems of the 912/912S and 914.
Regards
Nigel G
................. I suspect the 912S with its different compression
ratio and capacity will be
different again. Does anyone have a copy of the 912S manual (paper or
CD) so
that we can check this?..................
Regards
Nigel Charles
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