1975 Honda CB125S

vwrabbit

Member
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.
 

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vwrabbit

Member
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.
 

vwrabbit

Member
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.
 

vwrabbit

Member
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.
 

vwrabbit

Member
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?
 

crazypj

Split personality, I fake being smart
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.
 

vwrabbit

Member
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.
 

vwrabbit

Member
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.
 

hillsy

Active Member
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.......
 

vwrabbit

Member
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.
 

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vwrabbit

Member
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.
 

vwrabbit

Member
Picked up a used set of forks with the springs on the inside to clean up the front end. My gators and dust seals on the stock forks are falling apart. Also waiting on a replacement front brake switch and throttle cable.
 

Sonreir

Oregon
Verify your voltage levels with a decent multimeter. I ran a WPS for a while, but they're cheap and not very fault tolerant. That type of voltage regulator isn't always up to the requirements that LI-ION demands. So long as you're topping out at 14.5V or less, you should be OK. Give it some revs and if the voltage holds steady, you should see a good life out of it.
 

vwrabbit

Member
Thanks for getting me to check the battery. Should have checked earlier the stator output. Seems to be flat. No voltage. Nothing on pink or yellow. Battery was at about 8v. Picking up a charger. Need to check stator. And the wires in between.

Would a 360 stator fit?
 
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