james h
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| posted on 12/4/15 at 07:51 PM |
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Have I been unlucky with my replacement coils?
I thought I had damaged one of my coils (R1 carb engine), so bought another pair s/h off eBay.
Now I know the problem is actually the CDI/ECU/Ignition control unit I decided to test the coils, both sets. So the two on the car now (from eBay) and
the ones I removed.
The primary winding resistance should be 1.87 to 2.53 ohms at 20 degrees Celsius. On all four, I have readings of between 4.4 ohms to 4.6 ohms. Here
is a photo:
 
Primary winding resistance
Are all four coils equally f**ked? Why would that be? It is a bit weird how they are all equally off by a long way.
The secondary winding resistance is within spec, and the spark plug caps are pretty close too.
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gremlin1234
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| posted on 12/4/15 at 08:09 PM |
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what does the meter read with the probes connected together?
try changing the meter battery
try another meter - cheep digital multi meters do give a good indication, but really are not calibrated at such values
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james h
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| posted on 12/4/15 at 08:13 PM |
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quote:
Originally posted by gremlin1234
what does the meter read with the probes connected together?
Oops. Just after I posted the question I got someone else to measure it. He crossed the probes and we found that there is indeed inbuilt resistance,
which brings the readings inline.
Thanks! I think I need to get a better multimeter too, like you said.
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SteveWalker
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| posted on 12/4/15 at 08:31 PM |
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Get yourself a meter with a zero button. Hold the probes together and press the button and it will then subtract the reading (resistance of the leads)
from any readings that you take.
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