Re: nighthawk 550 electrical problem
- From: "R. Pierce Butler" <spamsucks@xxxxxxxxxx>
- Date: Thu, 22 Sep 2005 23:04:55 GMT
"krusty kritter" <kriyamanna@xxxxxxx> wrote in
news:1127401009.010428.255190@xxxxxxxxxxxxxxxxxxxxxxxxxxxx:
>
> jlpridge wrote:
>> I recently (last week) purchased this motorcycle. IT runs well with a
>> fully charged battery. However after I ride it for awhile and then park
>> overnight it does not seem to want to run well at all. In fact the
>> battery dies and the bike will not even start. I do not leave the key
>> on or in it overnight. When I jump start it the bike starts up and as
>> soon as I disconnect the jumper cables it dies. I do not want to start
>> blindly replacing stuff. Please help. I do like this bike.
>
> You need to start educating yourself on permanent magnet alternators
> and shunt type rectifier regulators and the typical Honda problems with
> bad electrical connections and too damned many of them.
>
> I've written about a hundred thousand words on the subject and they are
> all archived on Google, so you might try doing a google search for some
> of my older e-mail addresses, like "kaybearjr@aol", and
> "spectraltarsier@aol" +permanent magnet alternator and diodes and read
> up on the subject, because I'm NOT going to type all that stuff out
> again and I don't plan to put up a web page either.
>
> And, you'd better start hoping that the problem is just bad electrical
> connections, a defective rectifier regulator, or an old sulfated
> battery that won't take a full charge, because the 1983 CB-550
> Nighthawk was a glorious ONE YEAR ONLY model, and the aftermarket folks
> DO NOT make a replacement stator for the weird alternator with its
> 2-piece permanent magnet rotor.
>
> If nobody knows where you can get a good used stator (like a motorcycle
> salvage yard, I wish you lotsa luck finding one for such a rare
> motorbike), Honda will sell you a new one for about $275...
>
> Also, google the internet for "stator +CB550 Nighthawk". Somebody
> probably knows more than me about Nighthawks.
>
> Electrosport and other companies do make aftermarket voltage
> regulator/rectifier assemblies for your Nighthawk.
>
> Some information about troubleshooting motorcycle charging systems can
> be found here:
>
> http://www.electrosport.com/05_technical_start.html
>
> It may be more confusing than helpful. If I hadn't been to electrical
> tech school, I would get anything at all out of their diode testing
> procedure.
>
> An exploded view of the weird split rotor alternator with its air
> cooling fan can be seen at www.partsfish.com. Just register and you can
> look at the alternator parts fiche for free.
>
> I was trying to figure out how the alternator was driven, whether by
> gear or chain, but it's unclear from the drawing. However it's driven,
> the rotor MUST BE TURNING to charge the battery!
>
> One of the things that the instructors attempted to pound into our
> thick skulls at electrical tech school was that an alternator rotor
> must be ROTATING in order to generate any juice, but a whole generation
> of aircraft electricians was often fooled by that part of the
> troubleshooting process. I've only run across one alternator whose
> rotor wasn't turning though. It's something to keep in mind.
>
>
What will blow your mind is a brushless alternator. That's right. No
brushes at all. It is an interesting design and it is one that I wish had
had more of a following.
pierce
.
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