Spark plug wire's & caps questions

No eBay APP ID and/or Cert ID defined in Kunena configurationNo eBay APP ID and/or Cert ID defined in Kunena configurationI should have asked all my questions before purchasing any parts. But again I didn't, so here I go again.....LOL

I'm asking about two bikes......

First bike, 1980 kz750h1. I purchased these replacement coils.....


And I purchased these wires.....


My question about this setup for this bike is, do I need to ad a set of resistor caps to the works ?? Or will the suppression wires be all I need ??

Second bike, 1978 kz650b2...I hope to run the same replacement plug wires as listed above for the 750, on the 650. I'll probably be getting replacement coils for this 650 as well. Will I need to ad resistor caps to the 650 too ??

Thanks !!

Ignition Coils And Sparkplug Wire Choices
What came with the bike were ignition coils that even when new were marginal, add years of cooking under the tank in stop and go traffic, and the coils will fail when hot.

Replacement coils can be bought at www.z1enterprises.com . I believe "Emgo" is the brand. They also carry the popular Dyna 2.2 and 3 ohm coils along with replacement sparkplug wires.

Now, you have a choice on sparkplug wires:
1. Copper plug wires with no supression caps(the best choice, will produce greater spark, but will produce audio noise on Radio's & T.V.'s)

2. Copper plug wires with supression caps(a built in 5000 ohm resistor, that can some times fail, like what came with the bike).

3. Copper plug wires with no supression caps, but using resistor plugs(the "R" in the plug number, like B8RES).

4. Supression plug wires with no supression caps.

NEVER use resistor plugs and supression caps or supression plug wires, as now there will be two (2) sources of resistance in the secondary loop of the ignition coils, greatly reducing the spark energy.

Another choice is the Accel 3 ohm coils, with a similar primary(small wire) electrical connection using ring terminals as the Dyna ignition coils. Whatever brand of coil you go with, make sure the primary wires will clear the mounting hardware, as the spacers will come really close, possibly causing an electrical short, blowing fuses. Some riders have replaced the metal spacers with Nylon or Plastic non conductive ones, reducing the chance of an electrical problem.

KZ750-H1. My bike has the same ignition system as the 750H models. I installed the green Dyna 3.0 ohm coils & Dyna spark plug wire set (7mm copper core). The spark plug caps in the set are 135^o, but I would prefer 90^o for the outer cylinders. Dyna says to mount the coils facing forward but mine are towards the rear as that seemed to give better clearance for the plug wire towers from the valve cover reed caps.

KZ650-B2. Does the 650 still have the points ignition system? If so, I think you need 4.0 ohm coiils. The Emgos are listed as temporarily out of stock at Z1Enterprises.com, but if you can find them elsewhere, others say they are fine. I don't know if you have to worry about the resister caps n stuff or not.

Yea the 650 is bone stock. I'm sure it still has the points system. I forgot about that. I've heard about people converting the old point systems to the electronic, but I'm not familiar with the process. I think I will sit on that one for now, until I get the 750 running better.

So if I understand the posts correctly, I do not want to use any kind of suppression plugs or caps on the 750 with the suppression wires that I've got for it.

Thanks for all the posts !!

I understand the resistors in the sparkplug caps, reduce the RFI(Radio Frequency Interference) when the spark plugs fire., the noise heard on radio's and TV's.

Electronics has never been one of my strong points, so don't fall out of your chairs laughing while reading this.....

Why are there concerns about TV and radio interference with these old bikes ?? I've never seen one running down the road with a TV playing, and there are few, if any that came stock with radios, that I'm aware of. Or does this mean, that these bikes could interfere with these electronic devices in peoples homes, that we are passing while running down the road ??

I just don't get it ??

No, it's noise on people's homes that they'd here on the radio when you went down their street & possibly see on the TV screens as interference.

OK, so it's more of a courtesy thing, rather than a performance thing......I think I understand it a bit better now.

The signal generated by the firing of the plug will also be picked up by any solid state electronics nearby, (like your ignition control box, voltage regulator etc) with possible detrimental effects, also, I have had a fear of stopping next to a cop at a stop light who is talking on his radio and getting a ticket. That has not happened yet but who knows!