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Sooty plugs

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ac/dc
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Sooty plugs

#1 PostAuthor: ac/dc » Wed Aug 21, 2013 6:41 pm

Hi All tech heads

I have the 2 left plugs running reasonably clean
The 2 right plugs well sooted up
Setting are about the same on all the carbs
Is this a sign of a failing coil ?
Bike is a UK 1976 Z900 A4

Thanks
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z1bman
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#2 PostAuthor: z1bman » Wed Aug 21, 2013 6:49 pm

not coil related as it would affect cylinders 1+4 or 2+3. probably carb related invest in a colour tune
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Pigford
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#3 PostAuthor: Pigford » Wed Aug 21, 2013 7:29 pm

Still could be electrical? :shock: Have you got +12v at coils when bike is running?

Swap (1 & 2 - with 3 & 4) spark plugs - HT leads & caps.

Run bike whilst on centre stand (keep it level) - turn off fuel then stop engine. Drain each carb & measure what comes out each & compare qty.
And on the 7th day... Zeds were created!
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ac/dc
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help

#4 PostAuthor: ac/dc » Thu Aug 22, 2013 8:22 pm

Thanks both for the comments

Mark will try what you have said over the weekend and let you know

Malc
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