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Spark issue has me stumped

  • Thread starter Thread starter overboostin
  • Start date Start date
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overboostin

Guest
hey, I have a 78 gs750. I get healthy spark on 1 and 4 but I'm having an issue with 2 and 3. The issue has remained after I've done the following tests:

points upgraded to Dyna s
12 v to both orange coil power wires
.25v to both black and white coil wires when starting
coil replaced with another

ive switched spark leads, black and white wires to the Dyna and points prior and the spark travels so I've narrowed it down to somewhere in the black lead off the coil. This seems
strange to me though because both black and white go to .25v when cranking so it appears to have power. The strange thing is when I press the starter button it won't spark but as soon as I release the button I get one quick spark. What do you all think?
 
Just so I'm clear, you're getting proper current from both pickups on the new Dyna S?
 
Tried a new starter switch, and I'm getting proper current from the pickups. I'm getting the same reading from both pickups, 12v on orange and up to .25 on black and white when cracking. Don't think it's the plug caps, I've tried multiple coils.
 
overboostin said:
Tried a new starter switch, and I'm getting proper current from the pickups. I'm getting the same reading from both pickups, 12v on orange and up to .25 on black and white when cracking. Don't think it's the plug caps, I've tried multiple coils.
Click to expand...


Voltage is like pressure and current is like flow rate so they are different. You could have those exact same voltage values and have little to no current in the coils. You would check the primaries using an ohmmeter or amp meter if you have that for a direct current measurement.
 
Tried throwing the points back on and it seems to have solved the problem so it looks like my dyna is dead unfortunately. I'll be ordering another one monday and keep the points as a spare. Thanks for the help guys.
 
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