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  • Honda CB Master Cylinder Reservoir Cap ~ Replaces 43513-MJ6-006
Honda CB1100 CB1000 CB900 master cylinder reservoir cap 43513-MJ6-006
Reservoir cap kit, SKU 29-0080: product photo and 1974 Honda CB750K4 (A) Brake master cylinder fiche with the part location highlighted. Example diagram; check listing for fitment.
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Honda CB1100 CB1000 CB900 master cylinder reservoir cap 43513-MJ6-006

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Load image into Gallery viewer, Honda CB1100 CB1000 CB900 master cylinder reservoir cap 43513-MJ6-006
Load image into Gallery viewer, Reservoir cap kit, SKU 29-0080: product photo and 1974 Honda CB750K4 (A) Brake master cylinder fiche with the part location highlighted. Example diagram; check listing for fitment.

Honda CB Master Cylinder Reservoir Cap ~ Replaces 43513-MJ6-006

29-0080
$23.45 USD
In stock Usually ships the same or next business day
Check model fitment View fitment
Questions about this part? Contact us 4.8/5 1,330 store reviews
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60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
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Honda CB Master Cylinder Reservoir Cap ~ Replaces 43513-MJ6-006
$23.45 USD
Description

Replace your master cylinder reservoir cap with this Master Cylinder Reservoir Cap with Diaphragm, round OEM thread-on type. Cap replaces OEM #43513-MJ6-006, diaphragm replaces OEM #45520-300-000.

Key Features
• Master cylinder reservoir cap with diaphragm
• Round OEM thread-on type
• Cap replaces OEM #43513-MJ6-006
• Diaphragm replaces OEM #45520-300-000

Fitment / Compatibility

• Front master cylinder: Honda CB750K (1969‑78)
• CB750F (1975‑78) Supersport
• CB750A (1976‑78) Hondamatic
• Also rear master cylinder: CB750F (1975‑78) Supersport

• Rear master cylinder: Honda CB750F (1979‑82)

• Master cylinder: Honda CB900C (1980‑82) Custom
• CB900F (1981‑82) Supersport
• CB1000C (1983) Custom
• CB1100F (1983) Supersport

• Front master cylinder: Honda CB500K (1971‑73)
• CB500T (1975‑76)
• CB550F (1975‑77) Supersport
• CB550K (1974‑78)

• Honda CB400A (1978)
• CB400TII (1978)
• CB450K (1970‑74)

• Front master cylinder: Honda CB350F (1972‑74) Supersport
• CB400F (1975‑77) Supersport

• Honda CB350G (1973)
• CB360K (1974)
• CB360G (1974)
• CB360T (1975‑76)

Part Number: 29-0080

Read More
Read Less

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

Make Model Year
Honda CB750K Standard 1969
Honda CB750K 1970
Honda CB750K 1971
Honda CB750K 1972
Honda CB750K 1973
Honda CB750K 1974
Honda CB750K 1975
Honda CB750F Supersport 1975
Honda CB750K 1976
Honda CB750F 1976
Honda CB750A Hondamatic 1976
Honda CB750K 1977
Honda CB750F 1977
Honda CB750A 1977
Honda CB750K 1978
Honda CB750F 1978
Honda CB750A 1978
Honda CB750F Supersport 1979
Honda CB750F 1980
Honda CB750F 1981
Honda CB750F 1982
Honda CB900C Custom 1980
Honda CB900C 1981
Honda CB900F Supersport 1981
Honda CB900C 1982
Honda CB900F 1982
Honda CB1000C Custom 1983
Honda CB1100F Supersport 1983
Honda CB550K0 1974
Honda CB550K1 1975
Honda CB550K2 1976
Honda CB550K3 1977
Honda CB550K4 1978
Honda CB550F1 1975
Honda CB550F2 1976
Honda CB550F3 1977
Honda CB500K0 1971
Honda CB500K1 1972
Honda CB500K2 1973
Honda CB400F 1975
Honda CB400F 1976
Honda CB400F 1977
Honda CB350F0 1972
Honda CB350F0 1973
Honda CB350F1 1974
Honda CB500T Twin 1975
Honda CB500T Twin 1976
Honda CB400A 1978
Honda CB400TII Hawk 1978
Honda CB450K3 1970
Honda CB450K4 1971
Honda CB450K5 1972
Honda CB450K6 1973
Honda CB450K7 1974
Honda CB360T 1975
Honda CB360T 1976
Honda CB360G 1974
Honda CB360K0 1974
Honda CB350G 1973

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.

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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

What is included with master-cylinder cap 29-0080?

One round, thread-on reservoir cap and one diaphragm are included. The cap replaces Honda 43513-MJ6-006 and the diaphragm replaces Honda 45520-300-000.

How many cap assemblies are required per motorcycle?

Use one assembly per compatible master cylinder. Most listed applications use one at the stated front or rear position; a 1975-1978 CB750F uses the same type at both front and rear, so two replace both caps.

Will this cap replace a screw-retained reservoir cover?

No. It is the round OEM-style thread-on cap; match the reservoir design and Honda reference before ordering.

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