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electronic ignition question (aftermarket box ?)
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I've got an '88 boxer with a funny BMW ignition design. The bike
uses Hall sensors in combination with a centrifugal mechanical
advance rather than just using fixed sensors feeding a black box
electronic advance.
The bike uses a wasted spark design, sending one spark
to both cylinders on every revolution. This is what Harley
calls "dual fire". Full retard is 6 degrees, with ~25 degrees
advance and full advance at about 3000 RPM.
What I'm wondering is whether it's possible to buy just an
electronic advance unit and trigger the unit using the original
Hall pickup with the mechanical advance disabled.
I don't find anything on the market with a drop in sending
unit and suspect that the original unit could be adapted
fairly trivially, possibly with a swap of Hall transistors.
Any thoughts on aftermarket black boxes that might fit
the bill ? The mechanical advance is getting cranky and
I'd love to stop fighting with it.
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Have you tried new springs, lubing and all that? My '78 predates
electronic ignition but replaced it MANY years ago because it was
my least favorite tune up item, with first a Martek, then Dyna III
both utilizing the stock advance and later Boyer with electronic advance.
Got rid of the mechanical advance altogether and never missed them.
The Boyer has been very dependable and would probably fit but
I doubt it's made anymore. Maybe used?
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