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1970 CB450 charging problems. Just looking for a demonstration how to check the magneto, stator and rectifier, and maybe a quick explanation how to replace them

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Being a 1970 vehicle you have the older copper oxide rectifier,if you have charging problems,that type of rectifier output usually drops to about 1/2 battery voltage. It is located under the seat between the back fender and the bottom bar that the seat rests on,also more often than not, you get a really strong odor of rotten egg smell from a defective copper-oxide rectifier. Solution, replace with a 6-10 amp bridge rectifier from Radio Shack. Your charging voltage should be in the range of 13.8 -14v@ 1500 rpm.

Posted on Dec 04, 2012

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Posted on Jan 02, 2017

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SOURCE: Gsf400 bandit wont charge

If the battery is 2 years old or more it may be bad. Add water to each battery cell so that the plates are covered by the water. Charge the battery with a 1amp or 2 amp charger for about 5 hours. If it will not hold a charge then replace the battery.

At the site below you can download a free PDF service manual for your bike. The manual will tell you how to check the electrical components. It will tell you how to rebuild the engine as well, but save the rebuilding until next month. :)

http://www.carlsalter.com/motorcycle-manuals.asp

Please rate this answer. Thanks spooner1401!

Posted on Apr 17, 2009

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SOURCE: wire connector between stator & voltage reg/rectifier burnt

your voltage/reg. can be tested in a couple different ways check ground res. check res. then revs. bias on diodes you have ac in dc out it sounds like you may have a diode gone bad allowing ac curent to flow causing the wires to get hot

Posted on Jul 31, 2009

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SOURCE: Alternator not charging battery on getting 11.5

I had the same problem with my 900 that I just bought, the regulator was fried, so the local kaw shop replaced it with a new one off internet, then it promptly fried the new one, upon further investigation the rotor/armature was reading 1 ohm resistance, supposed toread 4/7 i think anyway, had to have alternater rebuilt , cost 370.00 , works fine now.

Posted on Aug 06, 2009

czaa
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SOURCE: Battery would not charge while bike is running.

u sure the alternator is producing-hows the wire connections to batery-inspec fuses n other partz of harness

Posted on Aug 24, 2009

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SOURCE: I can't find the oil filter on my 1970 honda cb450

It does not have an oil filter like what you are thinking of. It has a centrifugal oil filter. On the right end of the crankshaft there is a conical rotor. It turns with the crank and dirt particles get thrown to the inside wall of the rotor. The dirt builds up there and is cleaned out with a screwdriver, knife, small scraper, whatever. You will think you are destroying some type of gasket but dirt is all it is. You may need to remove the right side case for full access. I can't remember for sure.Go to www.babbittsonline.com/parts/viewbybrand/parts.aspx for diagrams and parts as available. Please rate my answer.


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Posted on Feb 21, 2010

Testimonial: "Perfect, I spent the day figuring it out without having to purchase a repair manual. Thanks for the info and picture!"

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1 Answer

WHAT WOULD MAKE IT DISCHARGE QUICK CHANGED BATTERY AND RECTIFIER


Check charging system. Charge battery. Could be the stator, rectifier, regulator. Or all. You may have to install a battery tender if you still have a problem. Good luck. Getting stuck in bad places suck.

Sep 23, 2015 | Motorcycles

1 Answer

Honda cb450 stator test


You should have a 3 phase charging system. Which means you have 3 leads coming out of the stator. They will usually be yellow or white. If you attach you meter leads from lead 1 to 2 you should usually get around .2 ohms. Then do the same check from 1 to 3 and 2 to 3 Then take one meter lead and connect it to chassis ground while touching all the leads , one at a time. If you get numbers of any sort when you're checking the ground the stator is bad. If not then your regulator. The more common problem with Honda is the regulator. Stators very rarely go bad.

Nov 02, 2013 | Motorcycles

1 Answer

I've got a 07 Grizzly 450 that I just recently purchased, I took it out this weekend for it's first long ride and it quit charging. Where do I start looking for problems? Stator rectifier or both, Also is...


The best way is to purchase the service manual and follow the instructions. Otherwise you can use a volt meter and do the voltage test at the battery while the engine is running is should be 14 volts at 1000rpm. If this doesn't check out, you then have to find out whether it's the stator or rectifier. Check the ac magneto charging coil resistance (right at the coupler) with your testor set to ohms. If this test checks out then its the rectifier, if it fails then it's your stator. The best and safest way is to use the service manual to do any work yourself. Good luck!

Sep 15, 2013 | Yamaha Motorcycles

1 Answer

My aprilia rs 125 battery keeps going flat i charge the battery up and last round about 1 mile then gose flat my engine then cuts out i leave for 10mins then it gose again im thinking the magneto as ive...


Hi, Swiftb152 and the usual suspects are:
1. Voltage regulator/rectifier not grounded.
2. Engine ground wire loose or broken.
3. Faulty voltage regulator/rectifier module.
4. Loose or broken wires in charging circuit.
5. Faulty stator and/or rotor.
For more information about your issue, please visit the websites below. Good luck and have a nice day.
DOWNLOAD 1999 Aprilia Rs 125

Mar 16, 2011 | 1999 Aprilia RS 125 Extrema

1 Answer

We have a 1992 Yamaha XJ600 seca 2. We recently purchased it and the battery won't hold a charge. So we bought a new battery and the bike won't charge the battery in return. We are not sure what exactly...


The first things that I would check is the Stator and the Regulator Rectifier. To check the stator and the Rectifier I would suggesting you get the repair manual. The repair manual is a Mechanics best friend. Not all bikes are the same and the manual will help with the diagnostics of both. Most of the time you can buy a manual on CD from ebay for about $5 to $11 dollars which is cheap compared to the paper back price.

Mar 02, 2011 | 1991 Yamaha XJ 600

2 Answers

I have a 98 Honda Shadow ACE VT750. The battery was replaced in May. I cannot get the battery to hold a charge. The starter fuse was just replaced. The bike will not start without jumper cables and...


Charge and load test the battery. If the battery sat dead for as little as two weeks , it could be sulfated and no good. If it is a Yuasa battery it only has a 6 month warranty , grab your receipt and race back to the dealer. They will charge and load test it three times . If it does not pass the load test you will get a new battery if it is still under warranty. Grab your voltmeter and unplug the plug with three yellow wires that is coming out of your stator. The three yellow wires coming from the stator should have continuity with each other and no continuity between any of the yellow wires and ground. That is the test for the stator. If the stator is good , the battery is good , then you probably have a bad regulator/rectifier. I suspect you just have a bad battery.

Nov 06, 2010 | 1999 Honda VT 750 CD Shadow A.C.E. Deluxe

2 Answers

How do I replace the magneto, I am only getting 12 v. out of my battery, and when I disconnect the pos cable it dies, so the magneto must be gone.


First off that is not how you check your "charging system" not a magneto! on these bikes you have a Stator that is in the LH side cover on that engine and you need to check the windings for continuity and for short to ground. I would consult a local dealer for voltage output test spec's on the stator. next is the regulator rectifier, this can be tested with a meter and again consult your dealer.

when checking battery voltage while running it is common to have to bring the engine up to a higher speed than idle when testing the charging system, I would advise around 2500~2800 rpm and expect voltage to be 13.5~14.5 volts.

Jan 03, 2010 | 2003 Yamaha Royal Star Venture

2 Answers

Bike not charging


get access to battery then put meter across it...with bike not running it should read about 12.6v...now start bike and rev to about 3000rpm watch meter it should start to rise up in voltage, maybe to around 13.5v to 14v then quickly regulate back down to 13v...regulator is working o.k. The battery could just have a cell going bad in it and not holding the charge... if still not working, check stator for any open windings...measure any two wires leading into the stator they should all be .1 to 1 ohm .. and if battery is more than three years old... i would suspect that too. if your battery voltage is less than 12v its probably on its way out.

Oct 02, 2009 | 2008 Suzuki GSX-R 600

2 Answers

2002 suzuki intruder vl1500 not charging battery


Check the voltage across the battery with the engine running - it should be greater than 13.5V. 
If less, then you have a failure in your charging system, either the stator and/or the Rectifier/Regulator. 
See this personally authored diagnostic guide on how to determine which part is defective. Also has a recommendation for excellent replacement as opposed to std OEM. 
http://www.triumphrat.net/speed-triple-forum/104504-charging-system-diagnostics-rectifier-regulator-upgrade.html

Aug 05, 2009 | 2002 Suzuki VL 1500 Intruder LC

5 Answers

Need a wiring schematic for the honda cb450 online


Here is a copy from Chilton's CB450, 1970 and above, hope it helps. I had to reduce it to monochrome in order to post it. It was 769K in grayscale.b2bce1e.gif

Feb 09, 2009 | 1975 Honda Cb 400 F

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