Honda CM400 Specs, Manuals, & Parts

If you’ve got a CM400 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 CM400.
  • Where you can buy aftermarket, OEM, and NOS parts for your bike.
  • Where you can find used CM400s for sale to start a new motorcycle project or get a parts bike.
  • Specs, details, and information about the history of the CM400.

MotorcycleZombies.com may earn an affiliate commission when you make a purchase through the links on this page.

CM400 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 CM400 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!


CM400 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 CM400, 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 CM400, 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 CM400 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 CM400 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 CM400, 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 CM400, 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 CM400 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 CM400.


Suspension & Brake Parts

Check here if you need to replace your CM400 brake pads, brake levers, or service your forks and rear suspension.


Wheels, Hubs, Chains & Sprockets

If you need to replace your CM400 drive chain and sprockets or service your wheels and hubs, find the right parts here.


Where to buy parts for a Honda CM400?

Some other good places to find parts for your CM400 include:

CM400 Specs & Details

The CM400 was a standard style motorcycle produced by Honda from 1979 to 1982, until it was upgraded to the CM450.

The CM400 featured a parallel twin, air cooled four stroke engine.

Noteable differences between models include spoked vs. Comstar wheels and drum vs. disc brakes.

Specs for the Honda CM400 include:

  • Top Speed: 97mph
  • Engine Displacement: 395cc
  • Cylinders/Engine Type: Twin, four stroke
  • Compression Ratio: 9.3:1
  • Transmission: 5 speed or 2-speed automatic.
  • Wet Weight: 405 lbs

Find a CM400 for Sale Near You

If you’re looking for a CM400 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 CM400s 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 CM400 without a title).

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