Cb500 no spark

[shredducus]

Ok, first let me start this off with, I've been searching for 2 days now for an answer specific to my question, with no avail.

Here is the question.

72 cb 500 has no spark at the plug.

Things I have done so far

Fully charged battery
No killswitch
Wiring is good.
12 Volts going to coils
4-5 ohms at both coils
Power through the blue and yellow wire going to the points
Set points

Still no spark at the plug.

The only thing I can think of is the coils aren't grounded. But, they are in their stock location. No tampering there.

Should these be grounded to the frame?

If you see anything I'm missing please feel free to chime in, but also please don't say " have you checked the battery" or "what about voltage going to the coils.


Thanks in advance.

 

[joea]

do you have power at the c.b. points? one should show voltage and the other none...then turn until the points change openings and check again... if you have power try dressing/cleaning points. good plugs and caps?(caps should not be a problem though).
joe@vcycle

 

[shredducus]

When you key is on. I have voltage at both the yellow and blue wire coming off the points. Points are new and I've taken some sandpaper and cleaned them.

I also took the caps off of the plug wires and trimmed the plug wires down to expose the wire inside and grounded that to the frame.

Still nothing. I'm completely stumped.

 

[thehands]

did you ever find out the problem?