Question about Moto Guzzi Motorcycles
Hi, I have a magneti marelli 6v B101 ignition coil on my 1960 Moto Guzzi Zigolo 110cc that I am rebuilding. One of the terminals has a letter "R" next to it and the other terminal is blank. Can anyone tell me which terminal goes to earth. Any help greatly appreciated.
The blank one and you can check this out after the bike is running or at least when you get the coil to fire by placing the lead part of a pencil in the gap between the spark plug or a good ground and the gap between the pencil and the spark plug wire so you can see the spark jump to the plug or ground from the plug wire and if the spark flash is on the wire side of the pencil the coil the coil is wired with wrong polarity if the system is a positive ground system. The coil will work no matter what the polarity ie no matter which of the terminals you connect to power and which you connect to ground, the only difference will be a somewhat weaker spark if electron flow is reversed from what it should be i.e. if it is from negative or ground to positive on a negative ground system or as on some older British ignition systems from positive to negative on a positive ground system. The flash will appear on the side of the pencil lead away from the current flow i.e. the flash will occur as the current leaves the pencil lead. Hope this helps.
Posted on Dec 11, 2014
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Posted on Jan 02, 2017
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