That's a SOHC CB125S and was my first "proper" bike which I got in 1976 and took my test on. This is a later one fitted with Honda's cable operated front disc brake like the CB200.
The engines are pretty good but there are a couple of things to look out for:
There is no oil filter. Instead it has a centrifugal filter on the right hand end of the crank and this needs cleaning regularly however the clutch case needs to come off. It's not a difficult job but nobody ever does it.
There are no camshaft bearings. The cam runs in the head itself so if there's any hint of oil starvation the cam picks up on the bearing surface and the only fix is a replacement head.
The cam chain tensioner is manually adjusted and again tends to get neglected.
I really enjoyed my 125S and it was a great first bike.
I haven't seen one for years and have no idea what parts availability is like now.
This is in fact a CB125J...
The 'S' model had a drum front brake.I have had two in my short 34 years of biking.My first was back in 1975 which was a 1972 in blue with white lines on the tank.The second one was a green one that I bought while I was doing up my CB750F2 which was back in 1981.Good little bikes but too small for my size frame.
This was the CG125...not sure if this engine is retrofittable to other 125 single frames or not though.
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