Honda CB125/CB125S Specs, Manuals, & Parts

If you’ve got a CB125 that you’re working on, you’ve come to the right place.

Whether you’re doing a full rebuild or restoration motorcycle project or you just need to complete some routine maintenance, we’ve got all the information and links to what you need to do the job right.

On this page you’ll find:

  • Links to the motorcycle service manual for your CB125.
  • Where you can buy aftermarket, OEM, and NOS parts for your bike.
  • Where you can find used CB125s for sale to start a new motorcycle project or get a parts bike.
  • Specs, details, and information about the history of the CB125.

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CB125 Service Manuals

The motorcycle service manual should always be one of the first things you pick up when you buy a new bike.

Whether you’re doing a full rebuild or just need to do a standard tune-up, having the proper owner’s manual is going to ensure you do the job the right way.

Find the CB125 service manual you need at the links below:

eManualonline.com has ready-to-download service manuals for a variety of years and model variations. Get yours today and get the job done right!


CB125 Aftermarket & OEM Parts

Sometimes finding the right parts for your bike can be as challenging as the repair itself.

If you’re working on a CB125, check out some of the resources below to find new and used replacement parts.

Be sure to confirm the fitment for your bike’s year and model variation.


Cams, Rockers & Valves

If you’re rebuilding the head of a CB125, you’ll need to pick up some new valves, seats, and seals.

Bigger jobs or engines that are in rough shape, may require new camshafts, cam chains, and rocker arms too.


Carburetor & Fuel Parts & Rebuild Kits

Carburetors are a “must-service” item for any motorcycle rebuild or restoration project.

Sometimes an aftermarket carb rebuild kit for your CB125 will do the trick. Other times, you may need new carbs altogether or specific OEM parts to get the job done right.


Clutch Parts

If your CB125 project has been sitting for a while, you may need to replace the clutch’s steel and friction plates.

Some other clutch parts you may need include:

  • Clutch levers.
  • Clutch cables.
  • Clutch basket, bolts, and springs.

Electrical, Ignition & Charging System Parts

Electrical systems on project bikes can be a source of all sorts of problems. If you’re experiencing electrical issues with your CB125, this is the parts category for you.

Find the right:

  • Wires and wiring harnesses.
  • Headlights, tail lights, and turn signals.
  • Switches, fuses, and relays.
  • Regulators and rectifiers.
  • Ignition units.
  • Coils and spark plug wires.
  • Starter motors.
  • Alternators.

Engine Gasket Sets, Cases, and Covers

If you’re doing any sort of engine work on your CB125, you’ll definitely want to pick up a new gasket set.

You can also find things like used replacement engine covers and stainless steel bolt kits.


Pistons, Piston Rings & Cylinders

If you’re tearing into your cylinders, you’re probably going to need a new set of piston rings.

If your CB125 engine is seized, you can get a replacement cylinder block and new pistons as well.


Side Covers, Body and Frame Parts

Find side covers, foot pegs, frame parts, and fairings for your CB125.


Suspension & Brake Parts

Check here if you need to replace your CB125 brake pads, brake levers, or service your forks and rear suspension.


Wheels, Hubs, Chains & Sprockets

If you need to replace your CB125 drive chain and sprockets or service your wheels and hubs, find the right parts here.


Where to buy parts for a Honda CB125?

Some other good places to find parts for your CB125 include:

CB125 Specs & Details

The CB125 was produced as an inline twin motorcycle by Honda from 1968 to 1970, and was reintroduced in 1970 as a single cylinder version.

Specs for the 1968-1970 Honda CB125 include:

  • Top Speed: 65 mph.
  • Engine Displacement: 124cc
  • Cylinders/Engine Type: SOHC Twin
  • Compression Ratio: 9.4:1
  • Wet Weight: 242 lbs.

Specs for the 1970-1985 Honda CB125S include:

  • Top Speed: 75 mph.
  • Engine Displacement: 124cc
  • Cylinders/Engine Type: Single cylinder 4 stroke
  • Compression Ratio: 9.2:1
  • Transmission: 5 speed
  • Wet Weight: 282 lbs.

Find a CB125 for Sale Near You

If you’re looking for a CB125 of your own or need a donor parts bike for your current motorcycle project, you can use the MotorcycleZombies.com used bike search tool to find what you’re looking for.

Click your state below to find used CB125s near you.

These motorcycle search engines search Craigslist listing for the entire state so you don’t have to individually search each specific region.

Once you’ve got the bike up and running, be sure to check back to our motorcycle registration and title guides if you need help getting plates (Especially if you’ve bought the CB125 without a title).

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