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Old 03-06-16, 10:39 AM   #11
Paul_Sterling
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Quote:
Originally Posted by listert View Post
i,m a little careful of taking the magneto apart.

does my magneto have a condensor?
it,s a chain driven square ML
should do, though I was once told that ML condensers rarely break down, and more likely was coil trouble, but from my limited experience, i have only seen condensers cause timing variations in respect of magneto troubles, nothing else in there seems to give that symptom (maybe points sticking or wrongly gapped, but that is easily checked).


Paul.
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Old 03-06-16, 10:45 AM   #12
nickh
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Probably a mica insulated job built in to the armature end plate and yes, they are less prone to breaking down than some later types.

NHH
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Old 03-06-16, 12:13 PM   #13
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Thinking back to my motorcycling days (60s), condenser problems sometimes exhibited similar symptoms.
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Old 03-06-16, 05:50 PM   #14
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took the mag apart and cleaned it.
reset the points but still only a bang

i think the mag needs a rebuilt then.
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Old 03-06-16, 07:24 PM   #15
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It sounds as though its firing at the top of the wrong top dead centre in other words,when both valves are slightly open
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Old 03-06-16, 10:55 PM   #16
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I had this problem a few years back with a lister A it turned out to be the plug! I was amazed by this I thought it was timing!

I know you have tried plugs so I would be looking at the mag,lead,condenser,ect
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Old 04-06-16, 09:04 AM   #17
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I had similar problem with my l type due to running without load with the choke fully open the suction pressure is reduced and not all the fuel gets drawn in so builds up in the carb and after a time will ignite and backfire through the carb and usually flood the engine if it doesn't backfire. Now I run on half choke if not working engine to increase suction pressure keeping carb clear. Also it would on occasion blow the gaskets on the valve covers . Hope this helps.
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Old 04-06-16, 02:02 PM   #18
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yes i thought i was a plug at first.
but tried 4 different.

it was actually the first rally i had load on the engine.
was powering a dynamo at nuenen by night
sometimes there was a bang when off load but din,t think much of it haha

regards Brian
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