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Honda ST90 Vintage Motorcycle Parts

Honda ST90 Mighty Dax parts for 1973–1975 fork, drum-brake and clutch repairs. Compare the 27 × 39 × 10.5 mm fork-seal pair, separate front and rear shoes, and individual clutch plates.

Browse Honda ST motorcycle parts.

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About the Honda ST90

Mighty Dax identity, fork dimensions and separate front and rear brake applications.

Honda Motorcycle Logo

The Honda ST90 Mighty Dax uses a horizontal four-stroke OHC engine. This guide focuses on its 1973–1975 fork seals, front and rear brake shoes, and individual clutch plates.

Build a brake and fork service order

Choose shoes for the brake position being repaired and compare the fitted fork with the 27 × 39 × 10.5 mm oil-seal pair. If the engine has been replaced, identify it before selecting clutch parts.

Know your ST90 before choosing partsST90 repair checkpoints

Start with the complete model and year, then check the assembly being repaired.

Front fork

27 × 39 × 10.5 mm seals

The featured fork oil seals list ST90 1973–1975 and are supplied as a set of two.

Brake shoes

Choose the correct position

Separate front and rear shoe listings include ST90 1973–1975.

Clutch

Individual plate replacement

The linked clutch plate lists ST90 1973–1975 and is sold individually.

Identify your motorcycle before orderingST90 identification checklist

Use these checks when a registration year or a model badge does not identify the fitted parts.

  • ST90 designation and model year checked against the motorcycle and documents.
  • Frame and engine markings, including known replacement-engine details.
  • Fork assembly and full removed-seal dimensions.
  • Front or rear brake position and the fitted wheel and brake assembly.
Need help identifying your ST90?

Contact PartsNMore with the model year, frame and engine markings, and clear photographs of the component being repaired.

Honda ST90 parts for repairs and restoration

Choose a repair below, or browse more parts for your selected model and year. Featured products retain the year ranges shown here; compare their contents with the work you plan to do.

Restoring or customizing your ST90?

For an ST90 with replacement bars or mirrors, check the fitted control mounts and available clearance. Measure first so that a styling choice does not compromise cable reach or control movement.

Measure handlebar diameter, mirror threads, cable reach and clearance. Universal parts may require modification and are not a confirmed ST90 fit.

Why buy your ST90 parts from PartsNMore?

Supplying motorcycle parts since 2002. Meet PartsNMore.

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Stock on our shelves

Items marked in stock are held in our warehouse.

Free ground shipping

USA: $50 USD or more. Canada: over $50 CAD. Shipping details.

60-day returns

Eligible unused, unaltered parts in original packaging. No restocking fee; electrical parts excluded. Return policy.

Need help choosing? Ask our parts team with your ST90 model, year and a photo of the part or its markings.

Honda ST90 Vintage Motorcycle parts questions

Can I choose ST90 parts from S90 or CT90 listings?
Only when the product explicitly lists your ST90 model year as well. The fork seals, brake shoes and clutch plate featured here list ST90 1973–1975. A shared 90cc designation does not establish fitment.
What size are the featured Honda ST90 fork seals?
The linked fork oil-seal listing specifies 27 × 39 × 10.5 mm, ST90 1973–1975, and a set of two. Compare all three dimensions with the removed seals and check for a replacement fork.
How do I choose ST90 front and rear brake shoes?
Start with the brake position being repaired, then compare the fitted assembly with the corresponding product. Both featured listings include ST90 1973–1975. Confirm package contents and quantity before placing the order.
Can I choose ST90 clutch parts from the frame model if the engine has been changed?
Identify the fitted engine first. A donor engine can require different clutch components from those associated with the original ST90 frame. The plate below lists ST90 1973–1975 and is sold individually; match the actual engine and required plate type before ordering.

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