Motorcycle Discussions > British Bikes
1932 BSA side valve starting problem
Billington:
I hope you can help me, I’m having trouble starting my 1932 W32-6 (500cc side valve).
I’ve have my magdyno professionally rebuilt, in the process replacing the three brush dynamo for a two brush dynamo on the advice of Tony Cooper who did the rebuild. Also on his advice I’ve remove the mechanical regulator coil and replaced it with a modern semiconductor solid state encapsulated regulator for motorcycles using the Lucas E3 type dynamo.
Since the rebuild I have had the bike running and have travelled about 3 miles. However today it would not start; it would only bake fire through the carburettor. This happens irrespective of the position of the ignition control and the air level.
Why will it run one day and not start the next? How can I diagnose and fix this problem.
Thank you for any helpful advice.
TGR90B:
I would ignore the dynamo as it has nothing to do with the spark. I would suspect that the magneto drive cog has slipped on the taper to the mag. Kick it over and see if there's still a spark. If so it's probably that the timing's slipped as above.
My only experience is with the later Lucas magdynos, so I could be talking out of the proverbial. ;D
R:
Changing the spark plug (temporarily) for something new and clean may also be a good move, test wise. Although it does sound more like the timing or spark has gone awol.
Billington:
Thanks for your posts. The spark plug is new. I also removed the cylinder head to ensure that the timing on the magdyno was correct. On this model the BSA manual of the time indicates the spark should occur at Top Dead Centre when the ignition control is fully retared.
TGR90B:
Yes, but have you re checked it?
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