Z1 coils

Hey guys. I purchased a set of 4 ohm coils from Z1 to replace the old ones on my C2. I think they're EMGO. Can someone tell me what the blue and black wire match up to on the C2? I'm looking at yellow/red, green and black on the bike side.

I wrote this initially for the bigger 4's, but the smaller 4's are toward the bottom of the "Guide" as they are wired reversed.

Ignition Coil Primary And Secondary Wiring

Ignition coils on the 80’s Kz1000,Kz1100’s and Gpz1100’s are wired the same, that is as you sit on the bike, the LEFT ignition coil primary(small wires) are two wires, RED and BLACK. The secondary (or sparkplug wires) go to #1 and #4 sparkplugs(your primary wiring may be different).

The cylinders are numbered left to right as you sit on the seat; #1,#2,#3, and #4.

For the RIGHT ignition coil, the primary wires, again are two wires, RED and GREEN, with the secondary going to #2 and #3.

The RED wire gets it’s voltage from the run/stop switch on the right handlebar switch pod.

The BLACK and GREEN wires connect to the IC Igniter(if the bike has the Kawasaki supplied electronic ignition) it actually gives the coils their grounds to fire the sparkplugs.

Primary(small wires) side of the coils will read between 1.8 to 3.0 ohms.

Secondary(sparkplug wire ports)side of the coil will read between 10.4K to 15.6K ohms. These ports are wired together, so it makes no difference which is used, as long as the correct coil to sparkplug configuration is followed.

The sparkplug caps should read 5K OHMS, any higher, or a reading of infinity means new caps should be ordered.

To stress the ignition coils, take a hair dryer, heat the coils and see if the ohm readings change from cold to hot . If they do, it’s time to buy new coils.

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Keep in mind, the wiring is reversed for the 550’s 650‘s and 750‘s, that is the RIGHT coil primary will be two wires, RED and BLACK with the secondary(sparkplugs) going to #1 and #4.

The LEFT coils primary wiring would be again two wires, RED and GREEN, with the secondary(sparkplugs) going to #2 and #3.

These engines have what is known as a “Wasted Spark” that is, a sparkplug will fire during an exhaust stroke. It does no damage and many other motorcycle engines have this design.

I'm just not too sure what they match up to on the new coils which each have a black and a blue cable.

I'd contact Z1 enterprises and see what they say....

Most Kwasaki's have a common Red or Red/Yellow wire going to the same terminal on each ignition coils, the other color will come from eother the ignition points(If you have them) or the Kawasaki IC Igniter it the bike has electronic ignition.

bloglos wrote: Hey guys. I purchased a set of 4 ohm coils from Z1 to replace the old ones on my C2. I think they're EMGO. Can someone tell me what the blue and black wire match up to on the C2? I'm looking at yellow/red, green and black on the bike side.

looking at yellow/red, green and black on the bike side

Yellow/red splits off to each coil (supplies switched battery voltage to each coil).

Small black wire connects to whichever coil has plug wires connected to the two outside spark plugs #1 and #4.

Small green wire connects to whichever coil has plug wires connected to the two inside spark plugs #2 and #3.




Good Fortune!

Yep, Sent them an email, I was just hoping someone had some experience with them so i could get them installed this weekend.

Thanks Patton, now I just need to figure out which is pos/neg on the coil. I guess rule of thumb would have the black cable be neg but I'm a little nervous to just guess.

bloglos wrote: Thanks Patton, now I just need to figure out which is pos/neg on the coil. I guess rule of thumb would have the black cable be neg but I'm a little nervous to just guess.

The coil primary terminals are non-polar, so it doesn't matter which terminal is used for which wire.

On the coil firing outside plugs #1 and #4, the red/yellow wire attaches to either primary terminal, and the black wire attaches to the other primary terminal.

Same with the other coil, red/yellow to one primary terminal, and green wire to the other primary terminal.

Good Fortune!

Oooooh, I see. Perfect thanks again.

bloglos wrote: Thanks Patton, now I just need to figure out which is pos/neg on the coil. I guess rule of thumb would have the black cable be neg but I'm a little nervous to just guess.

Black/blue/green are always negs and the pos is red, orange or red/yellow.

I suspect it would not matter if the coil low voltage wires were reversed since those go to the input winding of a transformer and I don't think reversing the secondary voltage would matter at all. You have two spark plugs across the secondary to ground so the coil won't know the difference. Just a thought.

That was far simpler then I had made it out in my head. Installed in 10 minutes and what a difference a set of new coils makes! It's like a brand new bike! It pulls a hell of a lot stronger now.

Ignition coils age, and where they're mounted traps heat. Add years of stop and go traffic, and the coils cook. Even when new, the stock Kawasaki ignition coils never put out a good spark and pregressively got weaker with time.