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Author Topic: 1975 Honda CB125S  (Read 926 times)

Offline vwrabbit

  • Posts: 34
1975 Honda CB125S
« on: May 04, 2017, 21:54:20 »
I've taken over ownership of my brother's old CB125. It's a '75 and when my brother got it back in the 90s, it was near mint. It's survived some stints off-road and at college while in his care.

Now that I have a garage and a little $, it's time to do what I've been wanting to ever since he got it. The plan is to build a cafe seat, clubman bars, convert all lights to LED and 12v. Replace the lollipop turn signals with something a little more modern, and maybe some rear sets.


Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #1 on: May 04, 2017, 21:59:43 »
Today I replaced the battery with a WPS 12v li-ion battery, a 12v regulator/rectifier and bodged an LED neutral light to verify the conversion worked. I also removed the battery tray, air box and toolbox.


Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #2 on: May 04, 2017, 22:04:47 »
Now I need to get the stock carb with new float back on. Can't get the bike with a Chinese carb to start. The original float was full of holes. Might also need to clean the points and check the valves. The bike ran two years ago and only had about 2700 miles on it.

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #3 on: May 04, 2017, 22:09:52 »
Once it's running, I plan to strip it down, clean it up maybe a repaint. If I can find a Benelli Mojave or CB160 tank cheap enough, I'll swap tanks.

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #4 on: May 09, 2017, 10:50:29 »
I replaced the Chinese carb with the stock and new float, added some more fuel and it starts but won't run for very long.  Need to double check timing.  It might be due to the fact the stock airbox has been removed...  Carb and jets were cleaned before reassembly.

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #5 on: May 09, 2017, 10:52:03 »
Also look to be missing the "caliper joint - 45104-107-720".  This mounts to the top of the caliper where the fender is bolted on, but my brother removed the fender a while back.  I have the fender, but don't seem to have the caliper joint.  Does anyone have one or know where I might find one?

Offline crazypj

  • Posts: 12289
  • Split personality, I fake being smart
Re: 1975 Honda CB125S
« Reply #6 on: May 09, 2017, 12:48:02 »
The cable operated brake can be made to work OK but parts are very rare. The top bracket should be relatively easy to find (eBay, etc) as the nylon and spring steel ratchet assembly is usually trash by now (I saw several 3~4 yr old ones rotted out when I worked at Honda dealers) Automatic adjustment rarely works properly, I found it easier to adjust when dismantled (but PITA as you have to assemble to check clearance)
Larger model hydraulic part is too big so if you find one get seller to take a pic with rule across mounting holes.
'you can take my word for it or argue until you find out I'm right'
I gave my girlfriend an orgasm the other night, but, she spat it back at me
 Some humans would do anything to see if it was possible to do it. If you put a large switch in some cave somewhere, with a sign on it saying 'End-of-the-World Switch. PLEASE DO NOT TOUCH', the paint wouldn't even have time to dry
 Itís not worth doing something unless someone, somewhere, would much rather you werenít doing it  (Terry Pratchett)
CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #7 on: May 16, 2017, 10:45:19 »
If I can't find the caliper joint, I'll probably fab something up.  Shouldn't be difficult. 

On another note, I got it purring like a kitten.  Cleaned the carb bowl and the pilot jet.  I also think getting it converted from 6V to 12V helps it run stronger. 

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #8 on: May 18, 2017, 11:05:39 »
Trimmed up the front fender and mounted it. Need to trim the back more to round it off...


Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #9 on: May 18, 2017, 23:07:13 »
Finally got my order from SuperBriteLEDs and replaced all of the bulbs. Also replaced the flasher with an adjustable LED compatible one. Turn signals work well. Even the 6v headlight seems to work well with the 12v conversion.

Got a superbike bar from Dennis Kirk that I need to drill out for wires. I'm going to mount it upside down to see if that works well. Won't be as aggressive as a clubman bar.

Offline hillsy

  • Posts: 4002
Re: 1975 Honda CB125S
« Reply #10 on: May 19, 2017, 04:18:40 »
Just cut some slots in the bottom of the switch blocks and run the wires underneath the bars. Seriously, drilling the bars and feeding wires through them is a pain in the ass - especially when you want to change them again.....which you probably will.......

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #11 on: May 19, 2017, 08:07:52 »
Thanks for the tip! Wasn't looking forward to drilling especially if I switch again.

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #12 on: May 20, 2017, 00:49:01 »
Got the superbike bars mounted upsidedown. Looks pretty good. The wife isn't so keen. She says it looks like a crotch rocket now. Thanks to hillsy's tip, I notched the controls to avoid drilling. Need to notch the right side a little more though.

I need to get better pictures tomorrow.

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #13 on: May 20, 2017, 17:48:58 »
Got it cleaned up a little with some help from the youngest. Hopefully she'll appreciate this enough to want it someday.

Offline vwrabbit

  • Posts: 34
Re: 1975 Honda CB125S
« Reply #14 on: May 20, 2017, 17:51:18 »
I also noticed that the steering stop is either broken or purposefully allows more turn to the right. The horn button will hit the tank when parked on the kick stand.