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Honda CB900 CB750 CB650 CB550 front fork oil lock piece 51432-371-003
Parts fiche reference for SKU 99-5318
Honda CB900 CB750 CB650 CB550 front fork oil lock piece 51432-371-003
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60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
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Honda CB900 CB750 CB650 CB550 front fork oil lock piece 51432-371-003

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Honda CB900 / CB750 / CB650 / CB550 Front Fork Oil Lock Piece ~ Genuine Honda 51432-371-003

99-5318
$29.95 USD

Sold individually

In stock Usually ships the same or next business day
Check model fitment View fitment
Questions about this part? Contact us 4.8/5 1,329 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
Honda CB900 / CB750 / CB650 / CB550 Front Fork Oil Lock Piece ~ Genuine Honda 51432-371-003
$29.95 USD
Description

This genuine Honda front fork oil lock piece fits inside the front fork assembly on the Honda CB models listed below. It works with the internal fork components to help control fork oil movement and damping action during compression and rebound.

Use this OEM Honda oil lock piece during front fork rebuilds, fork lower service, or restoration work where the original oil lock piece is damaged, missing, worn, or corroded. Honda used different fork internals across similar-looking models, so match the OEM number and front fork diagram before ordering.

Key Features

  • Genuine Honda OEM part
  • Honda OEM part number: 51432-371-003
  • Honda part description: PIECE, OIL LOCK
  • Front fork oil lock piece / fork damper oil lock component
  • Sold individually

Fitment / Compatibility

  • Honda CB900C (1980)
  • CB750A (1976-1978)
  • CB750C (1980-1981)
  • CB750F (1977-1980)
  • CB750K (1977-1981)
  • CB750L (1979)
  • CB650 (1979-1980)
  • CB650C (1980)
  • CB550F (1977)
  • CB550K (1977-1978)

Buyer Notes

Compare your old oil lock piece, front fork diagram, and OEM number before ordering. This is not a universal fork part.

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Check the listed model and year, then read any fitment notes in the description.

Make Model Year
Honda CB900C Custom 1980
Honda CB750A Hondamatic 1976
Honda CB750A 1977
Honda CB750A 1978
Honda CB750C Custom 1980
Honda CB750C 1981
Honda CB750F 1977
Honda CB750F 1978
Honda CB750F Supersport 1979
Honda CB750F 1980
Honda CB750K 1977
Honda CB750K 1978
Honda CB750K Standard 1979
Honda CB750K 1980
Honda CB750K 1981
Honda CB750L Limited 1979
Honda CB650 1979
Honda CB650 1980
Honda CB650C Custom 1980
Honda CB550F3 1977
Honda CB550K3 1977
Honda CB550K4 1978

Free ground shipping over $50

To the USA & Canada. In-stock orders usually ship from our own warehouse the same or next business day.

Estimated ground delivery after your order ships
DestinationDelivery time
USA4–7 business days
Canada2–6 business days

Ground shipping includes tracking, emailed when your order ships. Need it sooner? Express options are available at checkout.

See full shipping details

60-day returns on eligible parts

No restocking fees. Eligible parts must be unused, uninstalled, unaltered and complete. The 60-day window starts when your order is delivered.

Electrical parts are excluded from standard returns. Check return eligibility.

Start your return below. Wait for our instructions before mailing a part back.

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Other shipping options

Canada Post Economy: Available at checkout for select small items. Allow 1–3 weeks for delivery. No tracking or insurance is included.

Outside the USA & Canada: Delivery times vary by destination and shipping method. Buyers are responsible for applicable duties, taxes and import fees. We cannot mark orders as gifts.

Frequently Asked Questions

How many genuine Honda fork oil-lock pieces are included and required?

One Honda oil-lock piece, OEM 51432-371-003, is included. A complete two-leg fork service requires two when both fork legs use this same part.

What does the fork oil-lock piece do?

It forms part of the fork's hydraulic bottoming-control system. Wear, damage or an incorrect part can affect damping near the end of fork compression.

Should both fork legs be serviced together?

Yes. Use matching internal parts and equal oil type, oil level and assembly procedure in both legs. Inspect the damper rods, bushings, seals and fork tubes at the same time.

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