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Hi All,

Excuse my ignorance as i'm a japanese bike guy but my neighbour is restoring a small BSA trails bike. It has been retro fitted with an PVL ignition system which isnt working. The bike has had the system for many years working perfectly, recently had an engine rebuild (3rd party) and now electrics are completely dead.

When kicked over we can get a DC/AC reading from the stator (Blue/Black wires). We've checked resistence etc and all is correct. However when plugged into the coil we get nothing, not even a tiny spark. The coil is ground correctly and we're tripple checked all wires.

Is there a way to tell if these coils are still good? Any possible testing method?

Very annoyingly the indentification numbers on the coil are missing where its rubbed on the frame so if we do need another it could be tricky. I've added a couple of photos of the items.

Any help, pointers or suggestions would be ace. Thanks in advance


[img]https://imgur.com/TzHQhb4[/img]
[img]https://imgur.com/0kJYcmE[/img]
[img]https://imgur.com/LrgO8JO[/img]


SquiffyTheWombat
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Is the red wire grounded? if it is it will kill the sparks. disconnect and isolate the red wire and try again


BSA B31 500 "Stargazer"
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red is the kill wire
black is ground ... engine and coil must have an earth/ground connection .
(both earthed to frame , or better , jumpered with a wire from coil to engine )

if the coil is rubber mounted or mounted to new paint ..l there will not be the
Necessary ground connection .

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If this is a Rex Caunt converted PVL you might ask him at www.rexcauntracing.com

Last edited by linker48x; 06/03/21 5:27 am.

Moderated by  Jon W. Whitley 

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