Motorcycle Discussions > British Bikes
BSA Gold Star misfiring
bigjos:
Hi, looking for help once again....after spending a year refurbishing an old 350 gold star everything is now up together and looking good. It starts and runs fine in the workshop but when I take it out for a test ride it misfires as I try to accelerate, so that I have to ease the throttle back then just open gently to get some revs going - and even then it won’t rev very high.
In the workshop it seems to rev up ok......
I’m thinking it’s a carb. / fuel issue but not sure how to sort it?
Any tips appreciated.
iansoady:
I'd be looking at blocked main / needle jet to start with, but could easily be a magneto issue. Could also be poor fuel flow - blocked tap etc.
Rex:
The same symptoms as my recently-completed A7. Turned out it was a failing capacitor in the (rebuilt) mag.
john.k:
Assume you have checked that you have no supressed/high impedance ignition components?......also will assume you are aware they double magneto voltage and cause failure even in rebuilt mags?......but symptoms sound a bit like a faulty spark plug.
antoni:
--- Quote from: Rex on May 18, 2019, 05:55:21 PM ---The same symptoms as my recently-completed A7. Turned out it was a failing capacitor in the (rebuilt) mag.
--- End quote ---
Can't usually offer any advice on here, but this time...
I can say that condensers, which are capacitors, are often unused OLD stock. That doesn't help when a common failure-mode of the condensers is simply their age and not how much use they've had. Don't give your full trust in a NOS condenser.
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