Only have number 1 and 3 Leads firing

Please help I only have number 1-3 spark plug leads firing after buke being rebuilt It's a 79 kz1000 st

nate78 wrote: Please help I only have number 1-3 spark plug leads firing after buke being rebuilt It's a 79 kz1000 st

Brand new NGKB8ES spark plugs ?

Seated on bike, left side ignition coil should have its plug wires going to outside spark plugs #1 and #4.

Seated on bike, right side ignition coil should have its plug wires going to inside spark plugs #2 and #3.

Good Fortune!

There is no spark coming out of the coils on number 2-4 There is power to the coils and but only 1-3 have power to the leads

Check the primary(small wires) going to the ignition coils for tightness, also there is a 5000 ohm resistor inside the sparkplug caps. They have been known to go bad. To test them, unscrew the cap from the sparkplug wire, and then get a multimeter set on OHMS(looks like an upside down horseshoe,the letter Omega)range of 20K.

Put one probe where the sparkplug goes, and the other probe where the cap would screw onto the plug wire. If the cap is good(has resistance) before re-installing the tested cap(s), cut about 1/4" off the sparkplug wires, and then screw the caps back on the plug wires.

If the caps test bad(no resistance), new ones can be bought at most motorcycle shops or at www.z1enterprises.com

nate78 wrote: There is no spark coming out of the coils on number 2-4 There is power to the coils and but only 1-3 have power to the leads

2-4 should not be from the same coil.

1-3 should not be from the same coil.

Good Fortune!

Replace your coils like patton said theyre paired up 1-4/2-3 on the coils .
Are you checking at the plugs or the actual plug wire boots for fire?

I know their on a different coil that's the problem only 1 of the 2 leads will fire on both the coils they are not te wrong way round

Each ignition coil fires through its secondary loop.

The secondary loop consists of:
Secondary wiring inside the coil;
Two plug wires;
Two plug caps;
Two spark plugs;
Engine head.

For illustration, say the high tension voltage exits the coil through plug wire #1, travels through the plug wire, through the cap, and into top of plug, goes down through the plug, jumps the plug gap, goes from base of plug to engine head, through engine head to base of plug #4, jumps from base of plug #4 upward to top of plug, through #4 cap, through #4 plug wire, to coil's secondary winding.





A break in the loop's circuitry eliminates flow of voltage through the loop..
For example, if one spark plug is disconnected, neither plug will spark (unless voltage leaks between the disconnected wire and the engine head).
However, a carbon-fouled plug may pass current without sparking.

Thus, when #1 plug sparks and #4 plug doesn't spark, the secondary loop is being completed other than sparking across #4 plug, typically via a fouled non-sparking #4 plug that's allowing voltage to pass through its carbon filled gap.

Good Fortune!

that is some helpful info