Honda ST90 Specs, Manuals, & Parts

If you’ve got a ST90 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 ST90.
  • Where you can buy aftermarket, OEM, and NOS parts for your bike.
  • Where you can find used ST90s for sale to start a new motorcycle project or get a parts bike.
  • Specs, details, and information about the history of the ST90.

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ST90 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 ST90, 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 ST90, 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 ST90 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 ST90 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 ST90, 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 ST90, 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 ST90 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 ST90.


Suspension & Brake Parts

Check here if you need to replace your ST90 brake pads, brake levers, or service your forks and rear suspension.


Wheels, Hubs, Chains & Sprockets

If you need to replace your ST90 drive chain and sprockets or service your wheels and hubs, find the right parts here.


Where to buy parts for a Honda ST90?

Some other good places to find parts for your ST90 include:

ST90 Specs & Details

The ST90, or the Honda Trailsport, was a small displacement trail bike produced from 1973 to 1975.

Specs for the Honda ST90 include:

  • Top Speed: 43 mph
  • Engine Displacement: 89cc
  • Cylinders/Engine Type: Single
  • Transmission: 3 speed
  • Wet Weight: 143 lbs

Find a ST90 for Sale Near You

If you’re looking for a ST90 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 ST90s 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 ST90 without a title).

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