Author Topic: Not Charging CB550K [Problem Solved!] [Problem Broken Again!] (Read 16388 times)

campbmic · « **Reply #175 on:** March 13, 2010, 12:39:18 PM »

I ordered a used Stator coil and field coil that will be delivered today before I saw your posts hopefully those will take care of the problem!

However, when I was measuring the resistance with my electronic MM I got a measure of 1.0-1.1 and when I put the ends of the MM together I was getting .7.

Hopefully my MM just inst accurate enough to measure the problem and new parts will solve it!

scottly · « **Reply #176 on:** March 13, 2010, 03:33:26 PM »

I had been thinking to myself that I hadn't used a Wheatstone since I was 20, when I worked for a summer rewinding motor stators in a small CA town. Our highest priority customers used these motors in the oil fields, and when they burned up, they wanted them fixed ASAP. It dawned on me that surely in Texas you could find a shop that could test your unit. Wish I'd thought of it when we first tried to test your unit. Sure hope I'm right!!! I'll feel like crap if you wasted your money...

mixstup · « **Reply #177 on:** March 13, 2010, 05:53:08 PM »

Been following the thread since the beginning,as I too had issues on my similar 78 750....check carefully the wires around the rectifier plug as the insulation can deterieate and cause an open/ground or in my case complete melting of the ground wires within the harness,looked at three used rects with the same problem...didnt help that the PO used larger than rated fuses and nasty chocblocs everywhere! Good luck ,we're all looking forward to the happy ending!

Mick

campbmic · « **Reply #178 on:** March 13, 2010, 06:05:22 PM »

Well the guy bailed on me today and he says we will meet up tomorrow so I can buy the field and stator coils. so we will hve to wait until then to see! I've checked all of the plugs and I don't see ny visible deterioration =/

scottly · « **Reply #179 on:** March 13, 2010, 06:18:14 PM »

Might I ask how much these parts cost? (if this is a sensitive issue, PM me) After all, if he bailed, we have some time to decide if it's worth waiting until you can have a proper test done.

campbmic · « **Reply #180 on:** March 13, 2010, 06:29:52 PM »

$100

scottly · « **Reply #181 on:** March 13, 2010, 06:37:58 PM »

Then I would wait and have the stator tested first. Also, you don't necessarily know if the used unit is good until you try it. (As mixstup noted) Does your school have an electronics program? My favorite teacher would have turned your stator into a practical lab demo on the use of a Wheatstone.

campbmic · « **Reply #182 on:** March 13, 2010, 07:02:37 PM »

They most likely do, if the stator and field both have the correct resistance then is there anything else that can go wrong with them? Also what types of shops should I try to find locally that will test them and how much does it usually cost to have them tested?

campbmic · « **Reply #183 on:** March 13, 2010, 07:21:29 PM »

Also, I doubt this has anything to do with it but, I just checked my #1 and #4 are not firing. They have fuel and when the bike is running it runs the same even if I remove the #1 and #4 plug wires. When I do remove these wires I can kind of hear a little bit of a farting/sparking noise. But the #1 and #4 are just warm. Could this coil issue be part of my charging issue or is my #1 and #4 coil just bad?

scottly · « **Reply #184 on:** March 13, 2010, 07:28:53 PM »

If you can con the elementary electronics instructor into what a good lab exercise it is, free. If the seller is willing to back his goods up,(and trusts that you will not try to rip him off by pulling a switcheroo), have both units tested at the same time.

No idea what it would cost at a shop. Any shop that rewinds/repairs AC motors should have some sort of bridge; it's one of their main tools. Consider bribe (beer?)
In either case, provide the expected spec's.(Wheatstone is a zeroing-in process; it helps speed this up if you know what to expect)

steam-powered man · « **Reply #185 on:** March 13, 2010, 07:31:52 PM »

have a field coil if you need one, tested good per service manual at 4.8ohms on 200 scale. target is 4.9ohms +/-10%

also have a stator coil. service manual has a target of .35ohms, but when cheapo meter is set at lowest scale (200ohms) reads 1.0ohms. prob ok but ?

anyhow, if your contact bails will sell both for $20 plus shipping.
bobp

scottly · « **Reply #186 on:** March 13, 2010, 07:35:23 PM »

Hey campbmic, I'm itching to get back to the coil thing, too. Start a new thread.

campbmic · « **Reply #187 on:** March 13, 2010, 07:44:47 PM »

At 4k RPM I'm producing about 18 volts out of all of the yellow wires. I tested this right after leaving the alternator and right before going into the rectifier and it was the same. This is the total amount not the individual amount. If you can somehow test yours to see if it is close that would be awesome. If you produce a lot more then it would tell me that my alternator isn't producing enough.

Shoemanii do you know if the bike it was on was charging before you took it off? My cheapo 200 OHMS multimeter says mine is good as well =/

scottly · « **Reply #188 on:** March 13, 2010, 07:53:02 PM »

If I recall correctly, in one of your previous "AC" tests, you reported a significant difference between the voltages of the different phases. How about the noise? This has really bugged me since you first mentioned it. I'm thinking you may have an intermittent problem, the gremlin that comes and goes, like a homotron.

campbmic · « **Reply #189 on:** March 13, 2010, 07:56:45 PM »

Well I don't know if its a problem in between the alternator and the rectifier because the voltage right out of the alternator is the same voltage an inch before going into the rectifier.

scottly · « **Reply #190 on:** March 13, 2010, 07:59:18 PM »

Still have the noise?

campbmic · « **Reply #191 on:** March 13, 2010, 08:04:57 PM »

I just went out there and it is so faint you can only barely hear it with your ear right next to the stator cover. It sounds a bit different too. Its definitely an electric winding/whining noise but super super faint now.

scottly · « **Reply #192 on:** March 13, 2010, 08:06:40 PM »

Is your battery charging now?

campbmic · « **Reply #193 on:** March 13, 2010, 08:08:52 PM »

No its still not charging. I measured my voltage and it was 12.7. Went for a 5 mile ride with lights on and ran at 3-4k the whole time. When I got back it was 11.87.

steam-powered man · « **Reply #194 on:** March 13, 2010, 08:15:19 PM »

parts are from a donor bike, hadn't run in awhile. tested both per the manual, with results above.
bobp

scottly · « **Reply #195 on:** March 13, 2010, 08:17:31 PM »

Then I still suspect the stator. There should be no audible noise from this type of system: the only way this could happen, in my mind, is the windings vibrating in the stator, or the reg acting like a "buzzer", and we ruled the reg out by jumping the field coil.

campbmic · « **Reply #196 on:** March 13, 2010, 08:20:29 PM »

shoemanii, mine also says its good using a 200 ohm reader. Can I have both the field coil and stator coil rewound at one of these shops?

scottly · « **Reply #197 on:** March 13, 2010, 08:30:33 PM »

Probably cost a hell of a lot more than $20. If you are going to take a chance on buying a unit that hasn't been absolutely verified, I would rather risk $20 than $100.

I MUST add, at this point, that low voltage, as used in common alternators, stator failures are rare. Perhaps these bikes have a history of this: I have no personal experience...

campbmic · « **Reply #198 on:** March 13, 2010, 08:42:52 PM »

Well I guess I will get the $20 alternator and hopefully a 1/4 coil as well and throw them all on the bike and hope for the best! I guess theres not much more we can then wait for the parts $:-\$

scottly · « **Reply #199 on:** March 13, 2010, 08:53:56 PM »

Well, you could hit up a motor shop, plead hardship (poor college student, been busting your butt on this), and if they aren't too busy, they might bridge your stator for free.

My gut says your stator is toast, but I'm not willing to bet $100.

Man, if that spark plug wire has always been broken off, I can't wait to hear how much better the bike runs with a good coil!!!!!

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Author Topic: Not Charging CB550K [Problem Solved!] [Problem Broken Again!] (Read 16388 times)