I forget which mag fires the top plugs and which fires the
bottom, but the timing difference likely has to do with the way
the engineers want the combustion to proceed across
the combustion chamber from top to bottom or from
bottom to top.

Greg

At 12:06 PM 2/28/2005, John Steel wrote:
Do any of you know what the reason is that the timing on a C-75- or C-85-12 is set 
RIGHT MAG --28 DEGREES BEFORE TOP DEAD CENTER, AND the LEFT MAG -- 30 DEGREES BEFORE TOP DEAD CENTER ? ??
 
Just rebuilt my mags and I found these settings in the engine manuel.
Wondering WHY the difference in the right and the left mags.
 
Thanks
 
John Steel
94115

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