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Old 04-20-2009, 01:09 PM   #1
Shinglejohn
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Default CB650 charging issue(go figure)

So after several glorius months or riding my oversized vibrater known as the cb650 (or hillbilly650 due to its jacked up muddy origin), it all of a sudden drained a new battery and stranded me (in front of a bar/restuarant as luck would have it).

So after a long sunday of drinking with my buddy who bailed me out and dragged my bike home on his trailer i did a dianostic test according to this Fault chart

the charging system checked out:

I got just about 13.5v at 2500 and just below 14.8 at 5000.

I havnt been able to take it back out again as it has been raining all day, any ideas?

Last edited by Shinglejohn : 04-20-2009 at 01:39 PM.
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Old 04-20-2009, 01:26 PM   #2
seruzawa
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Check to see if the battery is draining through the alternator while the key is off. Or it could be that the battery is starting to short out due to age.
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Old 04-20-2009, 01:37 PM   #3
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The battery is brand new to the tune of about 2 weeks and it maintains its charge while the bike is not running.
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Old 04-20-2009, 01:38 PM   #4
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Check for a loose connection then. Or it could be that the regulator overheats after a while and ceases to function. It is solid state and earlier solid state devices weren't as good as the ones we are used to today.
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Old 04-20-2009, 03:16 PM   #5
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You're putting out more than enough juice, check the selenium rectifyer for continuity when it gets hot, that could be shutting down the charging system after a few miles.
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Old 04-24-2009, 10:07 AM   #6
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I retested the bike at operating temp and got much less output. After further investingation, i found my rotor to bad. I was getting a reading of about 2 Ohms between the copper rings, the manual specified 4-6.

I purchased a new rotor and an RR as, from what ive read, a bad rotor almost certainly fries your RR...

so...what im getting at is, would a bad rotor screw up my stator too?

Also, my charging system has been redone befor, one of the things the previous owner did was remove the fittings between the stator and the RR and hard wire them. does it matter which Yellow Wire goes where? How do i know which is which?
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Old 04-24-2009, 11:45 AM   #7
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Quote:
Originally Posted by Shinglejohn View Post
Also, my charging system has been redone befor, one of the things the previous owner did was remove the fittings between the stator and the RR and hard wire them. does it matter which Yellow Wire goes where? How do i know which is which?
Doesn't matter where the stator leads go - it's AC 3-phase output. If the motorcycle runs backward, just reverse any two of the yellow wires..........


So far as removing all the plugs - each connection is a place where corrosion can set-in, and INCREASE the resistance. PO did you a favour - if it's a "clean" install, mimic what he did when putting it all back-together. If not, clean it up a bit - use (PROPERLY!) crimped connections where possible, and a layer or two of heat-shrink tubing (don't forget to put it on the wire before connecting it!).

So far as "crimped" VS. "soldered" connections - it's essentially a wash, IF you can do either correctly. If you're a "belt an' suspenders" kinda guy, and want to do BOTH - CRIMP First, and THEN solder - not the other way 'round; as solder will "cold flow" and with heat/cool cycles the connection will loosen-up over time.

Good Luck.
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Old 04-24-2009, 12:23 PM   #8
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Quote:
Originally Posted by Shinglejohn View Post
I retested the bike at operating temp and got much less output. After further investingation, i found my rotor to bad. I was getting a reading of about 2 Ohms between the copper rings, the manual specified 4-6.

I purchased a new rotor and an RR as, from what ive read, a bad rotor almost certainly fries your RR...

so...what im getting at is, would a bad rotor screw up my stator too?

Also, my charging system has been redone befor, one of the things the previous owner did was remove the fittings between the stator and the RR and hard wire them. does it matter which Yellow Wire goes where? How do i know which is which?
A bad rotor SHOULDN'T hurt the stator. The rotor is putting out less field than it should, so that shouldn't harm the stator. SHOULDN'T is the operative word. Check the stator and check the output immediately after installing the new rotor.
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Old 04-24-2009, 01:14 PM   #9
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Quote:
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Doesn't matter where the stator leads go - it's AC 3-phase output. If the motorcycle runs backward, just reverse any two of the yellow wires..........
What do you mean if it runs backwards?


[quote=So far as removing all the plugs - each connection is a place where corrosion can set-in, and INCREASE the resistance. PO did you a favour -[/QUOTE]




Yeah, i was going to hard wire it when i recived the new parts as corrosion is a big problem on these things. I just wasnt sure about the wires.
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Old 04-24-2009, 02:10 PM   #10
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Quote:
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What do you mean if it runs backwards?
Yeah, if you start it up and the bike runs only in reverse, you gotta swap any two of the leads.

Unless you check it with a polarity-tester FIRST (pg 2): http://www.chauvin-arnoux.us/pdfs_ae...R-TESTTOOL.pdf

It's a common problem among ground-up bike builders and mechanics that do a lot of bike-alternator work. Easily fixed when discovered, though. Now and again, you get a DIY'er that doesn't know any better that runs-into this problem, and they either scrap the bike, ride it around backward all the time, or turn the engine around in the chassis.

All that work, just wasted....................... <shakes head sadly>
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