Odd Lucas auto-advance...

Joined
Mar 30, 2012
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Going through some old parts I saw this auto advance plate marked with both 5 and 12 degrees advance slots.
Any idea what it came from?
 
Joined
Mar 2, 2009
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Some BSA singles used that type of advance, 12 deg was used for battery ignition, 5 deg was used for ET, or energy transfer ignition. No battery, the coil got AC right from the alternator, if everything was perfect sometimes it would work.
 
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Jan 12, 2013
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Triumph did one as well , i think it was on the energy transfer model 350 or 500 .
 
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