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Discussion Starter #1
I have an intercom for the wife and I and I am getting spark noise through the device. Called the manufacturer and was told I need platinum resistor type plugs. My local dealership told me NGK doesn't make any for the Vulcan. Has anyone used some? What brand and reference number if possible.

I am sort of pulling hair out on this one...(and I have just a litle hair left!)

TIA


Toymaker
 

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If you can't find resistor plugs, you can also look for fixed resistor wires, which put the resistor in the plug boot.
 

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Discussion Starter #4
I have checked the NGK site. They do not show a platinum or iridium plug for the Vulcan 900.
 

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Discussion Starter #5
I am using resistor plugs now. The stock ones.
 

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Discussion Starter #6
Has anyone used a different plug in their Vulcans, other than the NGK CPR7ea-9 (NGK #3901)?
 

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Autolite does make one and it is a $2.89 plug. it is a traditional. pn 4303)

Our plug cross matches only to our bike and the 06 800. Now when I look up stuff for other years of the 800 they are a different plug number. But all the stats are the same. the thread is the same 10mm and the reach 19mm. the gap is of course adjustable. Even the heat range is the same.

Now that being said Nippon Denso makes a iridium plug for the 800 IU22 they list it for 1995 to 2001. And they make the U22ESR-N which is compatiable with our 900 and the 800, and when you go to www.GlobalDenso.com they list the U22ESR-N for our bike, but they say to use IW22 for iridium. But when I look up that IW22 on www.sparkplugs.com they say that the IW22 has a thread size of 14mm, and a reach of 19mm. and the socket needed is 13/16, not the 5/8 that the other plug uses for the socket size.

NGK standard Denso stardard Denso Iridium Denso Iridium
CPR7EA-9 U22ESR-N IU22 IW22
Thread 10mm 10mm 10mm 14mm
Reach 19mm 19mm 19mm 19mm
Hex Socket 5/8 5/8 5/8 13/16

Now I think that Denso screwed up on saying that the IW22 goes to our bike. They must mean we need the IU22.

Now according to sparkplugs.com the IU22 crossmatches to a NGK IX CR7EIX. But the NGK uses a larger center electrode. It is 0.6mm versus the Denso which is 0.4mm, and I have been under the understanding that smaller is better. There is a full Tech write up here. http://www.sparkplugs.com/pdfs/iri.pdf

Now back to the main thing. I have the same interferrance issue that you are talking about in my car. When I use my XM Inno, which to listen to I use a mini to rca adapter which is plugged into my radio through the cd changer port. When I rev the engine I can hear it through the car speakers, I can only hear it when I am using the cables. If I use the FM modulator I don't hear it. This makes me believe it is a ground issue, nothing to do with my plugs. I am running Bosch Platinum plus4. I do have a bad spark plug wire, one of the extensions that goes down through the DOHC has a crack in the side of it. Since I rarely drive this car, cuz I ride or drive my wifes or use my work take home truck I don't care to spend the money to fix it. So I just wrap the extension in electrical tape and it is okay for awhile. So I would start looking at grounds. Like this intercom it must have a ground wire, maybe it isn't cutting. I would say to look at your spark plug cables, but this bike is so new it shouldn't be a problem, but stranger things happen. Like the Vulcan 750 would come from the factory with no grease in the rear drive splines.
 

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Discussion Starter #8
Thanks Jace. Yeah, I've been looking at stats too. I believe that the NGK CR7EIX will work. You just have to look at a bunch of other bikes and re-cross-reference it back. If the weather permits, the wifey and I are going to Florida right after Christmas and I got a NADY intercom for us. Unit works well, but the spark noise is bad. So I am hoping that the iridium plugs will get rid of it.

We will see.
 

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I was told by a NGK rep that the IU22 would work. I compared the specs of this to the stock plug and they matched. It took a bit of digging but I found a heat range chart that showed the 2 plugs cross referenced. I called my parts guy and he's getting them for me. I think he said $11.95 each. I wont know how they perform until the weather moderates and I can log some real miles
 
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