Honda-SOHC
SOHC.co.uk Forums => SOHC Singles & Twins => Topic started by: Tomb on December 03, 2022, 01:52:38 PM
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Hi folks. My girlfriend is doing up (I won’t say restoring) a 1982 Honda CM125, she picked it up in a horrendous condition after being stored in a leaking shed for decades, although it will live again it’s condition was that not much could be restored to original. She is bringing it back to life to be used as a winter runabout.
The frame is solid but badly pitted and now hand painted, wheels the same. I hotwired a dead loss ignition and got the engine running after unfreezing it, compression is good.
After some comments about scrapping better bikes than my 500/4 (as well as much encouragement 😊) I can just Imagine some of you recoiling in horror 😂
We are now at the wiring stage, I have repaired PO’s wiring bodges to switch gear but need a wiring diagram and wondered if anyone can point to one.
TIA Tom
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Hi Tom, can’t help with wiring diagram but good luck with the “rustoration” I have similar dilemma with a Yam QT50 rusty and not worth spending money on, might just do a slightly rust reduction job on it just to get it roadworthy.😜
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Thanks Johnny, yeah sometimes they are so far gone that they just can not be restored. Shame really, it will live again but the finish will be “curbside” 😂
It was so bad the tank was rotted through completely, luckily the Chinese had faithfully copied the CM style when producing the Huoniao HN125 and we were able to pick up a good tank for £20 that’s a perfect match and fit.
Good luck with your QT50
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How friendly are you with your local Honda dealer? You can ask if they will let you photograph the relevant page of the workshop "blue book" i can try mine but not till after christmas mate sorry
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Thanks Bryan. Local Honda Dealer? None round here really, nearest one is probably an hour or two away, and found them very dismissive of the old bikes when I once visited.
I was hoping to find an online diagram. I can find every old Honda except the CM125. Old man Honda has a good selection of earlier wiring diagrams but alas not the CM125. We have a manual for Chinese 125s with a diagram that is very near which helps. I can work through the wiring to suss it out, just thought the obvious thing to do was ask. Thanks again.
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http://oldmanhonda.com/
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Thanks Bryan. Local Honda Dealer? None round here really, nearest one is probably an hour or two away, and found them very dismissive of the old bikes when I once visited.
I was hoping to find an online diagram. I can find every old Honda except the CM125. Old man Honda has a good selection of earlier wiring diagrams but alas not the CM125. We have a manual for Chinese 125s with a diagram that is very near which helps. I can work through the wiring to suss it out, just thought the obvious thing to do was ask. Thanks again.
I believe Honda used mostly the same colours in their wiring looms so I found the generic list of colours for the various components when I log on my PC I will attach the word document.
I found this list handy it reduced the number of unknowns considerably when I replaced my 400 loom.
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Haynes manual version - not sure how good the picture quality from my tablet is..but I can email you versions from my phone which are very clear, but too big to post on the site ….I don’t know how to make them smaller/below 3k!
My first bike was a CM125!
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..
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First pic is CM125c-c. Second is CM125c-f
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Brilliant, thanks fellas!!
All info is helpful. Andy, the images are as you say, a bit too blurry to make out on here, if you could email the images that would be great. I’ll PM you my email address
I should take some photos as we all love a photo of a bike build don’t we 😊
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Tom,
Email sent just now so let me know if they are readable!
Piccie would be great…I need to dig out one of mine too. BND714Y if I remember correctly.
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Absolutely brilliant images Andy. Many many thanks
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I don’t know what I’m doing wrong but the photos will not load
Anyway, a really successful day, most of the wiring done thanks to great help here, thanks chaps. Really needed that diagram to help sort out the clutch switch /neutral light and diode wiring for the starter solenoid. All lights working apart from back light which is yet to go on with rear mudguard, indicators working, we have a spark at the plugs.
The coil is after market fitted by PO and the spark is weak with the correct spec’ resistor plugs, tried an old none resistor plug of mine and get a much better spark so not sure what’s going on. I may simply use none resistor plugs if that works ok, any thoughts on that welcome.
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Photos, no idea why they are flipped on their sides.
[attach=1]
[attach=2]
And had a play with this little fella on Saturday
[attach=3]
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Love to see these chaotic looking work spaces! Even managed to capture either a very short sighted person or more than likely someone camera shy? 🤣
Nice work!
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Hahaha she said NOOOO don’t get me in the photos, why not though, it’s her bike and she’s doing most of the work.
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Next job, we were short of an exhaust collet so I’ve made one up quickly from a bit of old pipe.
[attach=1]
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Hahaha she said NOOOO don’t get me in the photos, why not though, it’s her bike and she’s doing most of the work.
🫣😂😂
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First off thank you for the help with this little CM125.
Little update. After fibreglassing the mudguards that quite frankly should have gone in the bin, and brushing on some silver paint (it’s a winter runabout costing, including initial purchase price, £135 so far) we had it assembled and ready to run, we had a bit of trouble getting it to run on two cylinders, the coil checked out at the correct 5ohms but I swapped it out anyway, all I had was a CBR600 coil at 3ohms and instant two cylinders and instant starting. So new coil needed.
A few more jobs will have it ready for pottering about on slippery winter roads, exhaust stud to repair, a working horn, plus a few other bits.
On another note, the little CM125 was 40 years old last month, on GOV. UK website it’s showing as not needing MOT but as we haven’t got to April yet still have to pay road tax, I tried to tax it at the Post Office but was refused as no MOT. My girlfriend phoned DVLA who said it doesn’t need an MOT, she was working in the next town so tried in their Post Office who happily taxed it. Just shows that however helpful our local Post Office staff usually are, mistakes are made.