1977 KZ750B Twin coil

Hello im new here and i love it already. I was wondering what coil replacement can i go for to substitute the original OEM version? Bike has one coil for both cylinders and its crappin out on me. I was wondering what other coils people have used on theirs? Is the only thing i have to worry about is the resistance of coil? The workshop manual says between 3.2 to 4.8 ohms on primary and between 10.4 to 15.6 on secondary. Im haveing trouble finding a right coil for the job. Thanks guys:side:

Probably the Dyna coils at www.dynaonline.com send them E-mail for any questions.

The workshop manual says between 3.2 to 4.8 ohms on primary and between 10.4 to 15.6 on secondary.

That's 10.4k to 15.6k ohms on secondary, as in 10,400 ohms to 15,600 ohms.

And I use the Accel coil on my 750 twins, they bolt right on. I don't know if the Dyna bolts right on or not, for the simple reason I've never used one

Oh yeah, Z1 Enterprises doesn't sell Accel coils, but lot's of other places do, I think the cheapest I have found is around $60 for one. But I haven't looked in awhile.

I believe Z1 sells the OEM equivalent for $36 (cheapest price I have ever seen for a new coil):

www.z1enterprises.com/SearchResult.aspx?All=True&KeyWords=coil




EM24-72451
Ignition Coil - 4 Ohm Dual Output - Kawasaki Suzuki
OEM: 33410-45012 -
$36.00


Ignition Coil - 4 Ohm Dual Output - Kawasaki Suzuki
EM24-72451

OEM: 33410-45012 -

Universal 4 Ohm Ignition Coil for Point Ignition - Mounting Points 90mm (3.5" ) Center-to-Center - Fits Kawasaki KZ900 Z1 KZ1000 1973-78
Fits some Suzuki models and early Honda CB750's
Will fit with other applications with 90mm Mount spacing.
Sold individually - two are needed for 4-cylinder bikes.

Please check bolt spacing before ordering

$36.00

thanks guys i appreciate the info and help. The accel coil is nice ive seen it used on ebay but that Z1 coil for 36 bucks or so looks tempting. Thanks again

I've bought Dyna coils from z1entrprises, for all 4 of my twins... I have the 5-Ohm on all the bikes with points (black) and the 3 Ohm for the one with electronic ignition (green). I got them for about $70 with wires... Haven't had a problem yet... great coils...

I don't really recall any modification... but I *did* use some old rubber inner tube to line the coil output stems from being so close to the frame mount...

Thanks for the info i think im going to go with the universal 4 ohm one,but it doesent look like the bolts are long enough to match up with the holes on frame. I guess some creative thinking would do it.The dyno coils look like there pretty cheaply made from the pictures,like theres nothing to them. But i guess they are pretty good since their double the prcie. But how did you end of bolting the dyno coil on there?? looks pretty short. And wouldnt 5 ohms on primary be to much?

Whheezzzz wrote:

....i think im going to go with the universal 4 ohm one.....

.....The dyno coils look like there pretty cheaply made from the pictures,like theres nothing to them....


...But how did you end of bolting the dyno coil on there?? looks pretty short. And wouldnt 5 ohms on primary be to much?

That's cool.

The Dyna is actually very well made. Once you feel one in your hand you get an understanding of how solidly it is built. It is very well encased in a thick outer casing. It's actually pretty large, I think the picture you're looking at might be deceiving.

The Dyna fits right into the existing bolt holes. It is only because both the outputs go to the side that makes it tight against the bracket. That's where I used the rubber.

Regarding Ohms, remember that Ohms is a rating of resistance. I think. Look I don't understand electronics much, but I *believe* that the 5 Ohm coil has more resistance, and therefore a slightly weaker power and spark, protecting the points. Ah, ignore that, I don't know what I'm talking about... :blink: :laugh:

Whheezzzz wrote:

Thanks for the info i think im going to go with the universal 4 ohm one,but it doesent look like the bolts are long enough to match up with the holes on frame. I guess some creative thinking would do it.The dyno coils look like there pretty cheaply made from the pictures,like theres nothing to them. But i guess they are pretty good since their double the prcie. But how did you end of bolting the dyno coil on there?? looks pretty short. And wouldnt 5 ohms on primary be to much?

No, that means 25% less current flowing down the primary into the points and 25% less power dissipation resulting from it. Going to a coil LESS than 4 Ohms loads the points and primary wiring more than stock. It it's a well designed 5 Ohm coil, it will put out plenty of spark.

thank you guys very much i went with the Black 5 ohm Dyna coil and yes a direct bolt on, never went Dyna route i have to say very good upgrade or the twin thanks again