The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Lucas, Ignition, Charging, Electrical => Topic started by: michael snellin on 08.05. 2013 17:01
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Hello , everyone, just wanted to know is there a difference between a manual/automatic mag, just that i was at a good jumble at the week end did not know what to do.????? urgh ! felt a bid of a fool really!! not having nothing, that came with the bike when i bought it.
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Manual mag has a plain drive gear in the timing box and a lever on the handle bars that you use to retard the timing duiring startup and advance it when driving. The automatic timing device is a version of the magneto drive gear that uses centrifugal force to advace the timing automatically when spinning fast. In this case, no lever on the bars.
Richard L.
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To further Richard's post. On the other end a manual type has a fitting for a cable near/next to a pickup.
http://www.a7a10.net/forum/index.php?topic=1045.0
Cheers
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The magneto is the same unit.
Manual advance had a different bolt on end.
Auto has a different bolt on drive gear.
And yes you can put both on a single maggy.
Bike beesa
Trevor
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Michael
Generally speaking "Iron" engines ie Golden Flashes have the auto set up and the sporty jobs, with Alloy heads, Rockets etc use the manual effort.