how to find out whats wrong (no spark) -CRF's Only Forums

irid3acrf · by **irid3acrf** » Wed Oct 10, 2007 9:22 pm

i need to know how to fins out whats wrong if i have no spark?? the plug is good and the stator is also. please help

thanks corey

124 · by **124** » Thu Oct 11, 2007 5:32 am

Do you have continuity from the secondary coil winding to the sparkplug? Without the sparkplug, what is the resistance of the secondary winding with the wire connected to the sparkplug cap?

Check for loose connections.
Have you replaced the plug with a BRAND new one?

irid3acrf · by **irid3acrf** » Fri Oct 19, 2007 10:54 pm

can u show me a pic of what ur talking about??

124 · by **124** » Mon Oct 22, 2007 11:43 am

Service manual.
www.helminc.com

irid3acrf · by **irid3acrf** » Mon Oct 22, 2007 1:41 pm

i have one now but its all weird when i check it?

124 · by **124** » Tue Oct 23, 2007 5:23 am

irid3acrf wrote:i have one now but its all weird when i check it?

?? What do you mean weird?
What kind of meter are you using?

Asmith · by **Asmith** » Tue Oct 23, 2007 5:35 am

124 wrote:
irid3acrf wrote:i have one now but its all weird when i check it?

?? What do you mean weird?
What kind of meter are you using?

irid3acrf · by **irid3acrf** » Tue Oct 23, 2007 5:12 pm

a pos 3 dollar one from harbor freight!!

124 · by **124** » Wed Oct 24, 2007 5:54 am

~ wrote:
124 wrote:
irid3acrf wrote:i have one now but its all weird when i check it?

?? What do you mean weird?
What kind of meter are you using?

That's hilarious...

a pos 3 dollar one from harbor freight!!

You may want to borrow one that is of a little better quality. So what is weird about your results? What did you measure?

irid3acrf · by **irid3acrf** » Wed Oct 24, 2007 1:28 pm

when i measure between a and c on the coil it reads nothing

124 · by **124** » Thu Oct 25, 2007 5:58 am

Ok, ok...let's take a step back.
There are 2 windings in a motorcycle ignition coil. Primary and secondary. The primary side of the coil has many times less "windings" of copper wire than the secondary side. Your primary side has the little wire and the secondary side has the sparkplug wire/cap or alternately called the "high tension lead". They both use a chassis ground to work correctly. That means the metal part of the coil itself is bolted to the frame of the motorcycle. This is what completes the electrical circuit for both the primary side and secondary side of the coil.

So when you measure the primary and secondary sides of the coil, you apply the positive lead of your tester to the end of the wire and the negative lead of the tester to the metal part of the coil WHEN ITS BOLTED ON THE BIKE.

irid3acrf · by **irid3acrf** » Thu Oct 25, 2007 5:01 pm

what do u guys use to mesure PEAK VOLTAGE? liek do u guys have a peak voltage adapter??

124 · by **124** » Fri Oct 26, 2007 5:23 am

There is a specific tester that measures peak voltage.
Or you can use a properly equipped oscilloscope.

pic

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