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Author Topic: 4 ohm coils, would they be ok on my 750?  (Read 1701 times)

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Offline honda750k

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4 ohm coils, would they be ok on my 750?
« on: July 22, 2009, 08:39:14 pm »
I"ve got a set of modern ignition coils off an 86 ZX1000 that I'd like to use,  I'm just not sure if they're ok to use.  they're 4 ohm coils though, so I'm unsure if they'll work or cause problems for my bike.
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Offline Gordon

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #1 on: July 23, 2009, 09:07:16 am »
Stock coils are 5ohm.  Many people run after market 3ohm coils on their 750's without any problems, as long as the charging system is in good condition.  So I don't see why a set of 4ohm coils would be a problem.
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Offline michrobi

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #2 on: July 23, 2009, 10:47:23 am »

What about those Dyna 2.2 ohm dual output coils? I thought those were the recommended coils for the CBs using a Dyna ignition. Crap, I hope I didn't order the wrong coils   ???
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline honda750k

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #3 on: July 23, 2009, 12:50:52 pm »
my issue is I'm still on points presently, mostly because I'm broke as can be, and this isnt a bike I intend to drop tons of cash on.
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Offline Gordon

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #4 on: July 23, 2009, 02:30:46 pm »
Quote from: michrobi on July 23, 2009, 10:47:23 am

What about those Dyna 2.2 ohm dual output coils? I thought those were the recommended coils for the CBs using a Dyna ignition. Crap, I hope I didn't order the wrong coils   ???

Where did you hear that?  I'm pretty sure that 2.2ohm coils would be extremely taxing on any of these bikes' charging systems. 
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Offline honda750k

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #5 on: July 23, 2009, 02:35:44 pm »
well, its a nonissue apparently. and WOW do I feel dumb.  rainwater got into the plg boots, and screwed with me until they dried out. 

I think all I really need is some new plug boots and good seals+dielectric grease to fix the problem permanently.
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Offline Gordon

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #6 on: July 23, 2009, 02:40:18 pm »
It's extremely rare for both coils in a set to go bad simultaneously.  Hell, it's rare for a single coil to go bad all of a sudden since it's a sealed unit with no moving parts.  When there's an ignition problem it's usually something other than the coils. 
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Offline michrobi

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #7 on: July 23, 2009, 02:55:12 pm »

That's how dynoman and Z1 sell them for CB750 SOHC bikes...
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline Gordon

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #8 on: July 23, 2009, 03:40:20 pm »
Quote from: michrobi on July 23, 2009, 02:55:12 pm

That's how dynoman and Z1 sell them for CB750 SOHC bikes...

What do you mean?  They sell coils in pairs, or they recommend 2.2ohms for the sohc4 750? 
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Offline michrobi

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #9 on: July 23, 2009, 03:43:35 pm »

They sell the Dyna 2000 with 2.2 OHM for the CB750 SOHC (with a 3.0 OHM option)

http://www.z1enterprises.com/detail.aspx?ID=2847

http://www.dynoman.net/ignition/dyna2000.html#cb750
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?

Offline Gordon

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #10 on: July 23, 2009, 03:52:36 pm »
Quote from: michrobi on July 23, 2009, 03:43:35 pm

They sell the Dyna 2000 with 2.2 OHM for the CB750 SOHC (with a 3.0 OHM option)

http://www.z1enterprises.com/detail.aspx?ID=2847

http://www.dynoman.net/ignition/dyna2000.html#cb750

Interesting... :-\  but there are all kinds of other things one can buy for a particular bike that aren't necessarily a good idea for it. 
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Offline michrobi

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Re: 4 ohm coils, would they be ok on my 750?
« Reply #11 on: July 23, 2009, 03:55:01 pm »

Very true. I called Chris at Z1 and he's going to ship me a set of 3.0 coils and I'll return the 2.2s. Glad I strolled by this thread. What I've read since this all says to get the 3.0 OHM.

Thanks Gordon
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-Mike

'78 CB750F All stock except for the powerplant. Jived it off my Dad in the spring of '94. He had it since 1980 and it's the first bike I ever rode on.

Current project: http://forums.sohc4.net/index.php?topic=67756

How's them SOHC4 patches coming?
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