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2005 BF 90 no spark

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dtoole

Regular Contributor
I have a 2005 BF 90 that has no spark on cylinders 1 and 4. I have swapped coils. It did not follow the coil. I have a DVA adaptor to test with but do not know which wires to test and what values I'm looking for. I searched online but found very little information.
 
dtoole said:
I have a 2005 BF 90 that has no spark on cylinders 1 and 4. I have swapped coils. It did not follow the coil. I have a DVA adaptor to test with but do not know which wires to test and what values I'm looking for. I searched online but found very little information.
Click to expand...
Does anyone know which wires feed high voltage to the CDI box. I have 4.8 volts on each pulser coil. Blue-black and Blue/green-black.
 
Hi,
I don't know but my BF20D outboard has a similar power supply stator assembly and the schematic for that shows a Green wire and a Black wire from the exciter coil.

Sorry if that's not correct but it's all I have.
 
jgmo said:
Hi,
I don't know but my BF20D outboard has a similar power supply stator assembly and the schematic for that shows a Green wire and a Black wire from the exciter coil.

Sorry if that's not correct but it's all I have.
Click to expand...
Thanks for the reply. I believe that mine is different. I have a 12-volt supply wire to the CDI box. It has proper voltage. I checked with mt DVA adaptor the voltage to the top terminal of the coils. Both have 200+ volts. Does anyone know what the other terminal on the coil does? voltage or ground? Could a defective spark plug lead cause this? Any help is appreciated....
 
Since this is a "wasted spark" system, both plugs, on each coil, fire at the same time.
I do think a plug or a plug wire that allowed the coil secondary pulse to ground without jumping the gap could cause no spark.
You can often see a plug wire with poor insulatiion give off faint sparks if observed in the dark.
A trick of lightly spritzing the plug wires with water is something I've never tried but I hear it works to find bad ones.
 
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