| nighthawk 550 electrical problem [message #460807] |
Fri, 30 September 2005 23:56 |
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krusty kritter Wrote:
> jlpridge wrote:
> -
> My Clymer manual should be here tomorrow. Once I look at the
> section referring to the rectifier I will try your fix.-
>
> I don't know if you understand the nature of Mark's solution to the
> remote sensing wire problem or not. If the remote sensing wire is open
> or has high resistance, the voltage regulating circuit in the
> rectifier
> regulator won't work and the voltage will get too high.
>
> That's which Mark moved his wire, he wanted to avoid burning up his
> stator from HIGH voltage. Your problem so far seems to be LOW voltage.
> Your stator could already be partially shorted out, but you need to do
> the open circuit voltage test to see if it's putting out AC voltage at
> 5000 to 7000 RPM.
>
> The rectifier regulator is a two part device which has the six diodes
> that change AC from the stator into DC that the battery can use.
>
> The voltage regulating circuit is a silicon control rectifier that
> grounds out one phase of the stator when the voltage gets too high.
> The
> silicon control rectifier is sometimes also called a "thyristor".
>
> When the SCR grounds one phase of the stator, that cuts the AC outout
> in half momentarily. The silicon control rectifier has enough built-in
> resistance, when it conducts electricity to ground it just gets hot
> without hurting itself.
>
> The remote sensing wire simply sends voltage to a component called a
> zener diode in the voltage regulating circuit of the rectifier
> regulator. A zener diode is a kind of diode that doesn't conduct
> electricity until the voltage reaches the desired level. Then the
> zener
> diode conducts electicity to the gate of the silicon control
> rectifier,
> telling it to
> shunt the high voltage (around 15 to 16 volts) to ground.
>
> That's why the rectifier regulator is also called a "shunt type
> regulator".
> It just wastes excess voltage into the frame of the motorbike.
> -
> meantime, one of my electrician friends at work asked if I had
> checked
> the coils yet. He said that it is possible if the resistance is too
> high on them they could be failing which would also impede the
> charging
> capacity of the bike's charging system. Have you ever heard anything
> like this before. It sure sound relevant due to how poorly the bike
> runs until it runs for a minute. It does not seem that it is an issue
> of warming up because even after it begins to run well it can go back
> at any moment to running poorly.-
>
> You might have loose connectors on the ignition control module or on
> the ignition coils themselves. If you want to see if you have enough
> voltage to produce adequate sparks, install a fully charged battery,
> remove the spark plugs and reinstall the plugs in the plastic
> connectors on the end of the ignition wires and crank the engine over
> while holding a spark plug about 1/4 of an inch away from the cylinder
> head. If you get a bright blue spark that jumps 1/4 of an inch, you
> have enough spark to rev up the engine to do your open circuit test.
>
> If you get a weak white spark that won't jump 1/4 of an inch, or it's
> orange or red, that's really weak and you'll need to figure out what
> the problem is. An electronic ignition system either works or it
> doesn't, the most likely problem for weak spark is dirty or loose
> connectors.
>
> If you don't have a weak spark, the most probable reason for bad
> running is dirty idle mixture jets. I've described what to do about
> that in this newsgroup about a bazillion times, so you can google that
> information up.
Krusty,
Well I just did the open circuit test and the reading
never went over 1.0 volts with the multimeter set on 200vac. Also I
just received the Clymer manual and it said to test the resistance
between the white wire and black wire from the stator and upon testing
them I got a reading of 1 ohm when the specs are between .4 and .6
ohms. Both results point to a bad stator but it still does not address
why the bike is moody. The smell of gas is overwhelming when the bike is
running leading me to believe it is running rich. But that does not
explain why all of the sudden it go from running ok to missing and
backfiring all of the sudden. It seems that letting it sit overnight
ensures that it will run well for a little while the next day and then
go back missing and backfiring.
--
jlpridge
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| Re: nighthawk 550 electrical problem [message #460825 ] |
Sat, 01 October 2005 15:38 |
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jlpridge wrote:
> Well I just did the open circuit test and the reading
> never went over 1.0 volts with the multimeter set on 200vac. Also I
> just received the Clymer manual and it said to test the resistance
> between the white wire and black wire from the stator and upon testing
> them I got a reading of 1 ohm when the specs are between .4 and .6
> ohms. Both results point to a bad stator but it still does not address
> why the bike is moody. The smell of gas is overwhelming when the bike is
> running leading me to believe it is running rich. But that does not
> explain why all of the sudden it go from running ok to missing and
> backfiring all of the sudden. It seems that letting it sit overnight
> ensures that it will run well for a little while the next day and then
> go back missing and backfiring.
If your spark is really weak, it can't ignite the fuel air mixture
properly and it will kick out a lot of unburned hydrocarbons. Also, if
the motorbike has sat for a few months without being ridden, you'll
smell some horrible odors coming out the exhaust. Compounds called
aldehydes break out of the gasoline molecules and and they really
stink.
Now, I'm wondering about the black wire and the white wire you
mentioned.
What is their function? I thought you said that the stator output wires
were yellow, that you also had a red/white wire, a green wire and a
black wire coming from the regulator.
Some Hondas had excited field alternators. They had a white wire and a
black wire going to carbon brushes on the alternator. The brushes
conduct current through the slip rings on the rotor and it becomes a
rotating electromagnet, inducing current into the stator windings.
Does your alternator have brushes? There are no brushes shown on the
parts fiche for the 1983 CB550 Nighthawk at www.partfish.com.
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