Cb200 charging issue

plagrone

plagrone

Coast to Coast
Okay, so I'm looking at buying a cb200 (1976 I think)

It was stripped and the frame powder coated professionally, and the engine has been rebuilt, new pistons, gaskets, etc. It runs pretty well minus this one charging issue. Prior to riding it, the battery read 12.5v, after the ride it measured 11.8v... Just up and down the street once, with a little revving over 4000rpm

Reading voltage from the terminals, voltage climbs to 13.8v or so with revving. Nothing read over 14v unfortunately.

Now. I've heard you can fit a cb360 stator in one of these things with some clever tapping, and I have a spare. (Also, I bet even a weak cb360 stator would produce enough wattage for this bike) I also have a cb200 seat in pretty good shape.
I'll replace reg/rectifier on principle, and also because it looks like the harness has been tampered with a little. Coils, plug boots, etc will probably end up getting replaced too.

It will need new tires also.

Would this be worth it if I can get it for $650 or so? Any insight into the charging issue would be useful as well. I'm not familiar with this bike
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That's actually a really clean little 200. I'm experiencing the same issue with my 175 (same charging components). Assuming the wiring is correctly run, Sonreir (local electric expert) recommends a rebuilt stator from Ricks Electrics. Google them, and select your bike. They make a stator for us. I just haven't gotten around to dropping the $175 on it but I bet that will eliminate our problem. If you're like me, you're charging a little...just not nearly enough.

I did a test fit of a 350 stator. You're right it will work, but way easier to buy a bolt on replacement.

$650 is pretty solid for a running bike that's 95% there, just not charging. The guys here can recommend some good ways to fix that.
 
13.8V is acceptable. I recommend trying a new battery before messing with the charging system.
 
Totally missed that sentence in the original post saying it was getting to 13.8. Sorry fellas.
 
Okay, I've got it home. Now I don't know what I was reading before, but its a little different now. Reading at battery terminals it reads anywhere from 5-7v when at high revs, draining the battery, and then while idling it drops a good .1 volt every couple seconds.

Could it be possible there are just some wires crossed up somewhere? He has an aftermarket regulator installed, I'll post some pics later today. I'm hoping this is an easy fix. The guy I bought it from thought it was the stator, but this isn't indicative of that I don't think.

Help Prease
 
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This is as good as I can do atm... I'll get a better one later. But you can see how clean it is. Fresh powdercoat wooooh

Here she is on the way home, just for fun
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You're reading something wrong. No way that bike would run at 5V-7V. 10V is usually a bare minimum and even then you'd be lucky.
 
Okay, may be due to vibration and a shitty voltmeter, but it's definitely draining the battery. I tried a different battery and same result. It drained the battery down to 12.0v and quit running. TGIF
 
Try a new battery (not just a different one).

As long as voltages are about 13.5V or so at 3,000 RPM, you shouldn't be having any issues.
 
The battery was a new one. 12v 6ah sealed AGM battery. I'll do some more testing today so I can get a little more info to help diagnose
 
I'm having trouble getting a reading on the terminals while it's running. It jumps all over the place. 5v, 7v, false readings... But one thing is for sure, when the key is in the start position, the battery drains, even when it's not running. Maybe something is grounded out that shouldn't be?
 
I just got a PDF of shop manual. (Shop PDF for this bike is hard to come by) I'll take a look at the wiring
 
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I'm hoping somebody might spot something amiss and speak up. The redundantly grounded rectifier is interesting. As is the in line fuse, and the engine-mounted condenser.

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The exhaust isn't mounted, it's missing an engine mount nut, and coil isn't mounted well, but I think I still got a good deal, these are little things.

Please help with this big thing!
 
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