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  • 1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm
Honda CB750 2ND oversize piston ring set +0.50mm 13031-392-004
SKU 05-7302 — approved OEM fiche location reference (REM20261028-0040)
1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm — Rear
1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm — Left
1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm — Right
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60-day returnsEligible unused parts Free ground shippingUSA & Canada over $50
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Honda CB750 2ND oversize piston ring set +0.50mm 13031-392-004

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Load image into Gallery viewer, Honda CB750 2ND oversize piston ring set +0.50mm 13031-392-004
Load image into Gallery viewer, SKU 05-7302 — approved OEM fiche location reference (REM20261028-0040)
Load image into Gallery viewer, 1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm — Rear
Load image into Gallery viewer, 1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm — Left
Load image into Gallery viewer, 1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm — Right

1976-78 Honda CB750 Piston Ring Set ~ 2nd Oversize +0.50mm

05-7302
$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 1,347 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 ~ 2nd Oversize +0.50mm
$23.45 USD
Description

Take your late-'70s CB750 to a 0.50mm oversize with this 2nd Oversize Piston Ring Set (+0.50mm), Japanese made to superior quality and replacing OEM Ref. #13031-392-000 / #13031-392-004. Fits 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
• 2nd oversize (+0.50mm) piston ring set
• Replaces OEM #13031-392-000 / #13031-392-004
• Japanese made, superior quality
• One piston per set (4 sets for full rebuild)
• Honda part name: Ring Set, Piston (Os 0.50)
• Interchangeable with Honda 13031-405-602

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

Part Number: 05-7302

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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 +0.50 mm ring sets are needed for the compatible SOHC Honda CB750 engine?

One Japanese-made ring set replacing Honda OEM 13031-392-000 or 13031-392-004 services one piston. Four sets are required for all four cylinders.

Which late SOHC CB750 engines use this second-oversize ring set?

Fitment covers 1977-1978 CB750K, 1977 CB750F, 1976-1978 CB750A, and 1976 CB750F engines from engine number 2551568 onward. The 1976 CB750F engine number must be checked before ordering.

Can these +0.50 mm rings be used in a standard CB750 cylinder?

No. They require a matching second-oversize piston and a cylinder correctly bored and honed 0.50 mm over standard. Verify bore size and ring end gap during assembly.

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