Honda CB750C No Spark

#1 08-20-2007, 09:05 PM

Hey Group,

My bike says nighthawk on the side of it, but it's a 1980 so I don't think
that's correct. Anyhow, The coil that fires the outer 2 cylinders is working
fine. The one that fires the inner 2 cylinders only seems to work if you can
get the RPM's up around 4,000. (hard to do on 2 cylinders). Anyhow, I
changed the coil and have the same problem. This bike has a mag, no points.
Any Suggestions?

1980 CB750C

#2 08-20-2007, 09:05 PM

Jason Nelson wrote:
> Hey Group,
>
> My bike says nighthawk on the side of it, but it's a 1980 so I don't
> think that's correct. Anyhow, The coil that fires the outer 2
> cylinders is working fine. The one that fires the inner 2 cylinders
> only seems to work if you can get the RPM's up around 4,000. (hard to
> do on 2 cylinders). Anyhow, I changed the coil and have the same
> problem. This bike has a mag, no points. Any Suggestions?
>
> 1980 CB750C

Are you sure *no points?* *No mag pickup?*

Measure the voltage to the coil. If you have voltage and no spark - bad
coil. If you have no voltage at the coil, it's the electronic CDI [if
that's what you have]. 1980? Are you sure *no points?*

--
Zyp

#3 08-21-2007, 08:17 AM

Well, lets start off by saying I'm a big dumb AS#. My CM400A has a mag with
a CDI. This has magnetic pickups. Anyhow, now that you got my head on
straight, is there away of checking the pickups with an ohm meter? As I
said, I have power getting to the coil that fires the outside cylinders. No
power getting to the inside cylinders. I admit to not having a lot of
experience with bikes. So any information you may have will be helpful. And
how about the Nighthawk name? The frame says 1980 CB750C.

Thanks Again!
Jason
"Zyp" <nospam@yahoo.com> wrote in message
news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
> Jason Nelson wrote:
>> Hey Group,
>>
>> My bike says nighthawk on the side of it, but it's a 1980 so I don't
>> think that's correct. Anyhow, The coil that fires the outer 2
>> cylinders is working fine. The one that fires the inner 2 cylinders
>> only seems to work if you can get the RPM's up around 4,000. (hard to
>> do on 2 cylinders). Anyhow, I changed the coil and have the same
>> problem. This bike has a mag, no points. Any Suggestions?
>>
>> 1980 CB750C
>
> Are you sure *no points?* *No mag pickup?*
>
> Measure the voltage to the coil. If you have voltage and no spark - bad
> coil. If you have no voltage at the coil, it's the electronic CDI [if
> that's what you have]. 1980? Are you sure *no points?*
>
> --
> Zyp
>

#4 08-21-2007, 08:17 AM

Jason Nelson wrote:
> Well, lets start off by saying I'm a big dumb AS#. My CM400A has a
> mag with a CDI. This has magnetic pickups. Anyhow, now that you got
> my head on straight, is there away of checking the pickups with an
> ohm meter? As I said, I have power getting to the coil that fires the
> outside cylinders. No power getting to the inside cylinders. I admit
> to not having a lot of experience with bikes. So any information you
> may have will be helpful. And how about the Nighthawk name? The frame
> says 1980 CB750C.
> Thanks Again!
> Jason
> "Zyp" <nospam@yahoo.com> wrote in message
> news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
>> Jason Nelson wrote:
>>> Hey Group,
>>>
>>> My bike says nighthawk on the side of it, but it's a 1980 so I don't
>>> think that's correct. Anyhow, The coil that fires the outer 2
>>> cylinders is working fine. The one that fires the inner 2 cylinders
>>> only seems to work if you can get the RPM's up around 4,000. (hard
>>> to do on 2 cylinders). Anyhow, I changed the coil and have the same
>>> problem. This bike has a mag, no points. Any Suggestions?
>>>
>>> 1980 CB750C
>>
>> Are you sure *no points?* *No mag pickup?*
>>
>> Measure the voltage to the coil. If you have voltage and no spark -
>> bad coil. If you have no voltage at the coil, it's the electronic
>> CDI [if that's what you have]. 1980? Are you sure *no points?*
>>
>> --
>> Zyp

Hmm - wanta sell it?

--
Zyp

#5 08-22-2007, 05:28 AM

Nope, Just want to fix it.

Jason
"Zyp" <nospam@yahoo.com> wrote in message
news:14WdnYOYY-iy21fbnZ2dnUVZ_h-vnZ2d@championbroadband.com...
> Jason Nelson wrote:
>> Well, lets start off by saying I'm a big dumb AS#. My CM400A has a
>> mag with a CDI. This has magnetic pickups. Anyhow, now that you got
>> my head on straight, is there away of checking the pickups with an
>> ohm meter? As I said, I have power getting to the coil that fires the
>> outside cylinders. No power getting to the inside cylinders. I admit
>> to not having a lot of experience with bikes. So any information you
>> may have will be helpful. And how about the Nighthawk name? The frame
>> says 1980 CB750C.
>> Thanks Again!
>> Jason
>> "Zyp" <nospam@yahoo.com> wrote in message
>> news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
>>> Jason Nelson wrote:
>>>> Hey Group,
>>>>
>>>> My bike says nighthawk on the side of it, but it's a 1980 so I don't
>>>> think that's correct. Anyhow, The coil that fires the outer 2
>>>> cylinders is working fine. The one that fires the inner 2 cylinders
>>>> only seems to work if you can get the RPM's up around 4,000. (hard
>>>> to do on 2 cylinders). Anyhow, I changed the coil and have the same
>>>> problem. This bike has a mag, no points. Any Suggestions?
>>>>
>>>> 1980 CB750C
>>>
>>> Are you sure *no points?* *No mag pickup?*
>>>
>>> Measure the voltage to the coil. If you have voltage and no spark -
>>> bad coil. If you have no voltage at the coil, it's the electronic
>>> CDI [if that's what you have]. 1980? Are you sure *no points?*
>>>
>>> --
>>> Zyp
>
> Hmm - wanta sell it?
>
> --
> Zyp
>

#6 08-23-2007, 04:51 PM

Jason Nelson wrote:
> Nope, Just want to fix it.
>
> Jason
> "Zyp" <nospam@yahoo.com> wrote in message
> news:14WdnYOYY-iy21fbnZ2dnUVZ_h-vnZ2d@championbroadband.com...
>> Jason Nelson wrote:
>>> Well, lets start off by saying I'm a big dumb AS#. My CM400A has a
>>> mag with a CDI. This has magnetic pickups. Anyhow, now that you got
>>> my head on straight, is there away of checking the pickups with an
>>> ohm meter? As I said, I have power getting to the coil that fires
>>> the outside cylinders. No power getting to the inside cylinders. I
>>> admit to not having a lot of experience with bikes. So any
>>> information you may have will be helpful. And how about the
>>> Nighthawk name? The frame says 1980 CB750C.
>>> Thanks Again!
>>> Jason
>>> "Zyp" <nospam@yahoo.com> wrote in message
>>> news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
>>>> Jason Nelson wrote:
>>>>> Hey Group,
>>>>>
>>>>> My bike says nighthawk on the side of it, but it's a 1980 so I
>>>>> don't think that's correct. Anyhow, The coil that fires the outer
>>>>> 2 cylinders is working fine. The one that fires the inner 2
>>>>> cylinders only seems to work if you can get the RPM's up around
>>>>> 4,000. (hard to do on 2 cylinders). Anyhow, I changed the coil
>>>>> and have the same problem. This bike has a mag, no points. Any
>>>>> Suggestions? 1980 CB750C
>>>>
>>>> Are you sure *no points?* *No mag pickup?*
>>>>
>>>> Measure the voltage to the coil. If you have voltage and no spark
>>>> - bad coil. If you have no voltage at the coil, it's the
>>>> electronic CDI [if that's what you have]. 1980? Are you sure *no
>>>> points?* --
>>>> Zyp
>>
>> Hmm - wanta sell it?
>>
>> --
>> Zyp

Hey, it's worth a try

Good luck fix'in it. Did ya find the problem?

--
Zyp

#7 08-24-2007, 10:21 AM

Yep, It's the pickups. One is working, the other is not. The pulse generator
is an expensive part. But I think it will be worth it in the end. This is my
3rd bike. I just don't work on them much. I have a 1979 CM400A, and a 1993
FZR600 as well. I think my next bike will be an HD.

Thanks,
Jason
"Zyp" <nospam@yahoo.com> wrote in message
news:UqGdnXJCW-SmglDbnZ2dnUVZ_rGrnZ2d@championbroadband.com...
> Jason Nelson wrote:
>> Nope, Just want to fix it.
>>
>> Jason
>> "Zyp" <nospam@yahoo.com> wrote in message
>> news:14WdnYOYY-iy21fbnZ2dnUVZ_h-vnZ2d@championbroadband.com...
>>> Jason Nelson wrote:
>>>> Well, lets start off by saying I'm a big dumb AS#. My CM400A has a
>>>> mag with a CDI. This has magnetic pickups. Anyhow, now that you got
>>>> my head on straight, is there away of checking the pickups with an
>>>> ohm meter? As I said, I have power getting to the coil that fires
>>>> the outside cylinders. No power getting to the inside cylinders. I
>>>> admit to not having a lot of experience with bikes. So any
>>>> information you may have will be helpful. And how about the
>>>> Nighthawk name? The frame says 1980 CB750C.
>>>> Thanks Again!
>>>> Jason
>>>> "Zyp" <nospam@yahoo.com> wrote in message
>>>> news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
>>>>> Jason Nelson wrote:
>>>>>> Hey Group,
>>>>>>
>>>>>> My bike says nighthawk on the side of it, but it's a 1980 so I
>>>>>> don't think that's correct. Anyhow, The coil that fires the outer
>>>>>> 2 cylinders is working fine. The one that fires the inner 2
>>>>>> cylinders only seems to work if you can get the RPM's up around
>>>>>> 4,000. (hard to do on 2 cylinders). Anyhow, I changed the coil
>>>>>> and have the same problem. This bike has a mag, no points. Any
>>>>>> Suggestions? 1980 CB750C
>>>>>
>>>>> Are you sure *no points?* *No mag pickup?*
>>>>>
>>>>> Measure the voltage to the coil. If you have voltage and no spark
>>>>> - bad coil. If you have no voltage at the coil, it's the
>>>>> electronic CDI [if that's what you have]. 1980? Are you sure *no
>>>>> points?* --
>>>>> Zyp
>>>
>>> Hmm - wanta sell it?
>>>
>>> --
>>> Zyp
>
> Hey, it's worth a try

>
> Good luck fix'in it. Did ya find the problem?
>
> --
> Zyp
>

#8 08-26-2007, 04:24 AM

Jason Nelson wrote:
> Yep, It's the pickups. One is working, the other is not. The pulse
> generator is an expensive part. But I think it will be worth it in
> the end. This is my 3rd bike. I just don't work on them much. I have
> a 1979 CM400A, and a 1993 FZR600 as well. I think my next bike will
> be an HD.
> Thanks,
> Jason
> "Zyp" <nospam@yahoo.com> wrote in message
> news:UqGdnXJCW-SmglDbnZ2dnUVZ_rGrnZ2d@championbroadband.com...
>> Jason Nelson wrote:
>>> Nope, Just want to fix it.
>>>
>>> Jason
>>> "Zyp" <nospam@yahoo.com> wrote in message
>>> news:14WdnYOYY-iy21fbnZ2dnUVZ_h-vnZ2d@championbroadband.com...
>>>> Jason Nelson wrote:
>>>>> Well, lets start off by saying I'm a big dumb AS#. My CM400A has a
>>>>> mag with a CDI. This has magnetic pickups. Anyhow, now that you
>>>>> got my head on straight, is there away of checking the pickups
>>>>> with an ohm meter? As I said, I have power getting to the coil
>>>>> that fires the outside cylinders. No power getting to the inside
>>>>> cylinders. I admit to not having a lot of experience with bikes.
>>>>> So any information you may have will be helpful. And how about the
>>>>> Nighthawk name? The frame says 1980 CB750C.
>>>>> Thanks Again!
>>>>> Jason
>>>>> "Zyp" <nospam@yahoo.com> wrote in message
>>>>> news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
>>>>>> Jason Nelson wrote:
>>>>>>> Hey Group,
>>>>>>>
>>>>>>> My bike says nighthawk on the side of it, but it's a 1980 so I
>>>>>>> don't think that's correct. Anyhow, The coil that fires the
>>>>>>> outer 2 cylinders is working fine. The one that fires the inner
>>>>>>> 2 cylinders only seems to work if you can get the RPM's up
>>>>>>> around 4,000. (hard to do on 2 cylinders). Anyhow, I changed
>>>>>>> the coil and have the same problem. This bike has a mag, no
>>>>>>> points. Any Suggestions? 1980 CB750C
>>>>>>
>>>>>> Are you sure *no points?* *No mag pickup?*
>>>>>>
>>>>>> Measure the voltage to the coil. If you have voltage and no
>>>>>> spark - bad coil. If you have no voltage at the coil, it's the
>>>>>> electronic CDI [if that's what you have]. 1980? Are you sure
>>>>>> *no points?* --
>>>>>> Zyp
>>>>
>>>> Hmm - wanta sell it?
>>>>
>>>> --
>>>> Zyp
>>
>> Hey, it's worth a try

>>
>> Good luck fix'in it. Did ya find the problem?
>>
>> --
>> Zyp

If you like working on bikes, the a Harley Davidson is it. It will need
constant attention LOL

--
Zyp

#9 08-29-2007, 02:46 AM

I know, I was joking. Anyhow, a set of pickups and an OKI later and it's now
up and running. I have to take care of some carb issues now, but once that's
done, it should be ready.

Jason
"Zyp" <nospam@yahoo.com> wrote in message
news:n-2dnQfOXrouE03bnZ2dnUVZ_vmlnZ2d@championbroadband.c om...
> Jason Nelson wrote:
>> Yep, It's the pickups. One is working, the other is not. The pulse
>> generator is an expensive part. But I think it will be worth it in
>> the end. This is my 3rd bike. I just don't work on them much. I have
>> a 1979 CM400A, and a 1993 FZR600 as well. I think my next bike will
>> be an HD.
>> Thanks,
>> Jason
>> "Zyp" <nospam@yahoo.com> wrote in message
>> news:UqGdnXJCW-SmglDbnZ2dnUVZ_rGrnZ2d@championbroadband.com...
>>> Jason Nelson wrote:
>>>> Nope, Just want to fix it.
>>>>
>>>> Jason
>>>> "Zyp" <nospam@yahoo.com> wrote in message
>>>> news:14WdnYOYY-iy21fbnZ2dnUVZ_h-vnZ2d@championbroadband.com...
>>>>> Jason Nelson wrote:
>>>>>> Well, lets start off by saying I'm a big dumb AS#. My CM400A has a
>>>>>> mag with a CDI. This has magnetic pickups. Anyhow, now that you
>>>>>> got my head on straight, is there away of checking the pickups
>>>>>> with an ohm meter? As I said, I have power getting to the coil
>>>>>> that fires the outside cylinders. No power getting to the inside
>>>>>> cylinders. I admit to not having a lot of experience with bikes.
>>>>>> So any information you may have will be helpful. And how about the
>>>>>> Nighthawk name? The frame says 1980 CB750C.
>>>>>> Thanks Again!
>>>>>> Jason
>>>>>> "Zyp" <nospam@yahoo.com> wrote in message
>>>>>> news:Tt6dnQyKRY0XgFTbnZ2dnUVZ_s-pnZ2d@championbroadband.com...
>>>>>>> Jason Nelson wrote:
>>>>>>>> Hey Group,
>>>>>>>>
>>>>>>>> My bike says nighthawk on the side of it, but it's a 1980 so I
>>>>>>>> don't think that's correct. Anyhow, The coil that fires the
>>>>>>>> outer 2 cylinders is working fine. The one that fires the inner
>>>>>>>> 2 cylinders only seems to work if you can get the RPM's up
>>>>>>>> around 4,000. (hard to do on 2 cylinders). Anyhow, I changed
>>>>>>>> the coil and have the same problem. This bike has a mag, no
>>>>>>>> points. Any Suggestions? 1980 CB750C
>>>>>>>
>>>>>>> Are you sure *no points?* *No mag pickup?*
>>>>>>>
>>>>>>> Measure the voltage to the coil. If you have voltage and no
>>>>>>> spark - bad coil. If you have no voltage at the coil, it's the
>>>>>>> electronic CDI [if that's what you have]. 1980? Are you sure
>>>>>>> *no points?* --
>>>>>>> Zyp
>>>>>
>>>>> Hmm - wanta sell it?
>>>>>
>>>>> --
>>>>> Zyp
>>>
>>> Hey, it's worth a try

>>>
>>> Good luck fix'in it. Did ya find the problem?
>>>
>>> --
>>> Zyp
>
> If you like working on bikes, the a Harley Davidson is it. It will need
> constant attention LOL
>
> --
> Zyp
>

McBiker · #10 10-21-2008, 06:24 PM

Of course Harleys requires more maintenance