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  • 1976-78 Honda CB750 Piston Ring Set ~ 1st Oversize +0.25mm
Honda CB750 1ST oversize piston ring set +0.25mm 13021-392-004
SKU 05-7301 — approved OEM fiche location reference (REM20261028-0039)
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60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
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Honda CB750 1ST oversize piston ring set +0.25mm 13021-392-004

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Load image into Gallery viewer, Honda CB750 1ST oversize piston ring set +0.25mm 13021-392-004
Load image into Gallery viewer, SKU 05-7301 — approved OEM fiche location reference (REM20261028-0039)

1976-78 Honda CB750 Piston Ring Set ~ 1st Oversize +0.25mm

05-7301
$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 1,332 store reviews
Secure checkoutProtected payment
60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
Browse all parts
1976-78 Honda CB750 Piston Ring Set ~ 1st Oversize +0.25mm
$23.45 USD
Description

Step up to a 0.25mm oversize with this 1st Oversize Piston Ring Set (+0.25mm), Japanese made to superior quality and replacing OEM Ref. #13021-392-000 / #13021-392-004. Matched to the late-'70s CB750 lineup, including the 1977-78 CB750K, 1977 CB750F Supersport, 1976-78 CB750A Hondamatic, and 1976 CB750F Supersport (with engine serial numbers above #2551568).

Note: this set includes rings for one piston. 4 sets needed to rebuild all pistons.

Key Features
• 1st oversize (+0.25mm) piston ring set
• Replaces OEM #13021-392-000 / #13021-392-004
• Japanese made, superior quality
• One piston per set (4 sets for full rebuild)
• Honda part name: Ring Set, Piston (Os 0.25)
• Interchangeable with Honda 13021-405-602

Fitment / Compatibility
• Honda CB750K (1977‑78)
• CB750F (1977) Supersport
• CB750A (1976‑78) Hondamatic
• CB750F (1976) Supersport, engine serial above #2551568

Part Number: 05-7301

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

Make Model Year
Honda CB750A Hondamatic 1976
Honda CB750K 1977
Honda CB750F 1977
Honda CB750A 1977
Honda CB750K 1978
Honda CB750A 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.

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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

How many +0.25 mm ring sets are needed for a complete late SOHC CB750 rebuild?

One Japanese-made ring set replacing Honda OEM 13021-392-000 or 13021-392-004 services one piston. The four-cylinder engine requires four sets.

Which 1976-1978 Honda CB750 engines use this first-oversize ring set?

It fits 1977-1978 CB750K, 1977 CB750F, 1976-1978 CB750A, and 1976 CB750F engines from engine number 2551568 onward. Check the 1976 CB750F engine number rather than relying only on the frame year.

What must match a +0.25 mm CB750 piston ring set?

The engine needs +0.25 mm pistons and cylinders bored and finished to the corresponding first-oversize specification. Confirm piston size, bore measurement, and ring end gap before assembly.

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