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Author Topic: Spark plug cap ohm question  (Read 1157 times)

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Offline Johnny5

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Spark plug cap ohm question
« on: September 12, 2011, 09:38:23 AM »
On my CB750K7, should I have 5ohm plug caps or 10ohm? Im running non-resistor type of spark plugs. I tested the caps that are on the bike now and all but one read in the 9.5ohm range. One read at 11.5ohms, so I replaced that cap with a good one I had laying around. Im going to just replace them all with new ones, but just curious on which I should get, 5 or 10ohm?
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Offline Duke McDukiedook

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Re: Spark plug cap ohm question
« Reply #1 on: September 12, 2011, 09:40:29 AM »
You sure you don't mean 5K Ohms and 10 Kohms? Big difference.
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Offline Johnny5

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Re: Spark plug cap ohm question
« Reply #2 on: September 12, 2011, 09:47:40 AM »
Quote from: Industrial-sized Dukiedook on September 12, 2011, 09:40:29 AM
You sure you don't mean 5K Ohms and 10 Kohms? Big difference.

Yes, 5 and 10K.

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Offline Duke McDukiedook

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Re: Spark plug cap ohm question
« Reply #3 on: September 12, 2011, 11:21:32 AM »
I think stock on the 750's were 10KOhms, 11 or 9.5 is not that far off. I am not sure what the replacement tolerance is for these caps though. TT would probably have a better idea.
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"Well, Mr. Carpetbagger. We got somethin' in this territory called the Missouri boat ride."   Josey Wales

"It's Baltimore, gentlemen. The gods will not save you." Ervin Burrell

CB750 K3 crat | (2) 1986 VFR750F

Offline seanbarney41

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Re: Spark plug cap ohm question
« Reply #4 on: September 12, 2011, 02:32:27 PM »
...hope someone knows...I was wondering the same :-\...
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Offline keiths

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Re: Spark plug cap ohm question
« Reply #5 on: September 13, 2011, 06:37:33 PM »
I have read that Honda used 5K caps on everything until the mid ninety's. The one's on my CB350F were reading around 12K with one at 52K. It runs much better with the new 5K caps.
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Offline TwoTired

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Re: Spark plug cap ohm question
« Reply #6 on: September 13, 2011, 07:04:21 PM »
The 550s had 10K from factory.
CB750s were 5K ohm. Possibly there were exceptions.
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Offline keiths

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Re: Spark plug cap ohm question
« Reply #7 on: September 13, 2011, 07:10:11 PM »
Thanks TT. I guess you can't believe everything you read. Here is where I got mine. http://www.newmotorcycleparts.com/electrical/coil_accessories.html
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