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I'm not that familiar with BSA's but my Triumph will start up and run on one cylinder. So the side with the good spark should at least get it going. I would start chasing a fuel problem. Gas in tank, through petcocks, through any filters, gas in float bowl, float and needle valve working, gas/odor on plug? Would try to isolate spark difference. Condition of points/gap/timing, switch plug leads, switch coils.
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Htown16, Houston, Texas
1978 T140E Bonneville, 2004 XL 1200R Sportster
Everything will be alright in the end.
If its not alright, its not the end.
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