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The Vintage Japanese Motorcycle Owners Group: Discussion Forums

Vintage Japanese Motorcycle Owners Group :: View topic - 75 CB125 converted to 12v, seems to be missing, then stalls.


75 CB125 converted to 12v, seems to be missing, then stalls.

 
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vwrabbit
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Joined: May 15, 2017
Posts: 3

PostPosted: Thu Jun 08, 2017 7:05 pm    Post subject: 75 CB125 converted to 12v, seems to be missing, then stalls. Reply with quote

Just converted my 75 CB125 to 12v. Replaced the rectifier with a regulator/rectifier, all LED lights... I had it running fine for a while. Now it seems to be missing and then stalls after it warms up. When I try to start it again it'll run for only a few seconds and then stall again with a pop.
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dorT500
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Joined: Jul 10, 2008
Posts: 2994
Location: Galveston County, Texas

PostPosted: Sat Jun 10, 2017 8:48 am    Post subject: Reply with quote

No replies in a couple of days and I hate to see that but I do wonder with the limited information given (no details on conversion) if the recent problem is unrelated…just coincidental?

I really would not be of much help troubleshooting the conversion, if indeed a miss-step or an omission in the conversion is the problem……. but after reading just a bit about 6 volt to 12 volt conversion, the first two things that come to mind (maybe a couple of other components also mentioned in the links below) are the stator windings and ignition coil/coils……..that is if they were changed in your conversion.

...and then there is the question of battery condition. Brand new or not, it should be tested with a multi-meter to see if it is fully charged .....12.6 volts or better. If it is showing a full charge, let it sit overnight not connected to anything and see if it is holding a full charge. A battery can be defective right out of the box and if a lead/acid battery...........if not filled and charged EXACTLY per the instructions, can fail prematurely. Better yet......test it with a mini hydrometer if it is a lead/acid battery.

By some step by step trouble shooting to see if you can eliminate the conversion and/or battery as the problem, you can, after some further description of what it happening hope to get some help from members here.

Below are some threads me thinks you have seen before but I post as reference for others who may be able to help you.

That's 'all I got'. Smile Arrow

Good Luck and Welcome to the VJMOG.



http://www.chopcult.com/forum/showthread.php?t=33361

http://www.dotheton.com/forum/index.php?PHPSESSID=n39mgqst1lth0d0rocdbitiq53&topic=13083.msg128765#msg128765

https://www.thumpertalk.com/forums/topic/842589-6v-to-12v-conversion-cbxlsl-125/

http://www.vjmog.com/ftopict-1433-windings.html Arrow

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vwrabbit
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Joined: May 15, 2017
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PostPosted: Sat Jun 10, 2017 6:51 pm    Post subject: Reply with quote

Turned out to be float level way off. Smile
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vwrabbit
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Joined: May 15, 2017
Posts: 3

PostPosted: Sat Jun 10, 2017 6:54 pm    Post subject: Reply with quote

Thanks for the welcome. I know my details were a little lacking. Didn't want to overwhelm with too much information.

I had just replaced float needle and thought the level was good, but was measuring wrong. She's running again. Need to check timing as it's still not quite smooth.
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