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84 Shovelhead no spark to spark plugs

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  #1  
Old 05-09-2019 | 03:52 PM
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littlenick
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Default 84 Shovelhead no spark to spark plugs

I am rebuilding a 84 shovel head and I changed out the Ignition from the stock Ignition with the external module to a advance unit and electric dual fire Ignition I change the spark plugs and the Ignition coil I am getting power to the coil but not to the spark plugs But still not getting spark still need help
 
  #2  
Old 05-09-2019 | 04:02 PM
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Did you check your spark plug wires?
 
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Old 05-09-2019 | 04:05 PM
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They are new i got them maybe a year or so ago and the bike has not moved since i put them on it
 
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Old 05-09-2019 | 04:08 PM
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If you got power at the coil and not the plugs, sure appears to be something between the two.
 
  #5  
Old 05-09-2019 | 04:10 PM
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Ok i will try to replace them again and see if that helps thamk you
 
  #6  
Old 05-09-2019 | 04:32 PM
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Originally Posted by littlenick
Ok i will try to replace them again and see if that helps thamk you
Don't have to replace just test with a meter to check if resistance is within spec. You can look up how to test spark plug wire.

Just curious how you are testing for spark?
 
  #7  
Old 05-09-2019 | 05:15 PM
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power to the coil is good. now you need to see if the red light blinks on the ignition pickup. also verify the wire from the coil to the pickup is good.
 
  #8  
Old 05-10-2019 | 06:10 AM
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Like joe said, is the status light blinking when turning the motor over? The pink wire is the trigger, it momentarily grounds the coil to complete the circuit of the primary side of the coil which will energize the secondary side of the coil sending 20-30,000v to the plugs.
So pull the plugs and hook them back up to the plug wires and then ground them. With the ignition on and confirmed power to the positive side of the coil, momentarily ground the negative side of the coil. you should see the spark plugs fire..

ONE MORE THING, MAKE SURE WHEN YOU GROUND THE COIL THAT IT'S ONLY MOMENTARY... IF YOU KEEP IT GROUNDED TOO LONG YOU COULD BURN UP THE PRIMARY SIDE OF THE COIL...
 

Last edited by 98hotrodfatboy; 05-10-2019 at 06:30 AM.
  #9  
Old 05-13-2019 | 04:31 PM
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The pink light is flashing when the Ignition is on and I have power to the coil I put the spark plug up next to a piece of metal and saw no spark when I hit the start button
 
  #10  
Old 05-13-2019 | 04:32 PM
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Originally Posted by littlenick
The pink light is flashing when the Ignition is on and I have power to the coil I put the spark plug up next to a piece of metal and saw no spark when I hit the start button
The body [steel part] of the plug must be grounded... the only spark is between the electrodes...
If I am mistaken about what you said... excuse me... You are in good hands... carry on..

In the old days this was a good place for children.... "Here hold this a second"
Prolly child abuse or some crap now days tho...ya gotta hold it yerself!!!!

Finally... you are risking "run-on" if you run the starter without plugs in the engine... Not at all uncommon if the plugs are out... One good place for John Jzjz's dual relay system...
 

Last edited by Racepres; 05-13-2019 at 04:39 PM.


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