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  • 1979-83 Honda CB750 DOHC Piston Ring Set ~ 1st Oversize +0.25mm
Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004
0.25 mm piston rings, SKU 05-7501: product photo and 1980 Honda CB750K (A) Crankshaft / Piston fiche with the part location highlighted. Example diagram; check listing for fitment.
Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004 – rendered product view
Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004 – rendered left view
Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004 – rendered right view
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Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004

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Load image into Gallery viewer, Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004
Load image into Gallery viewer, 0.25 mm piston rings, SKU 05-7501: product photo and 1980 Honda CB750K (A) Crankshaft / Piston fiche with the part location highlighted. Example diagram; check listing for fitment.
Load image into Gallery viewer, Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004 – rendered product view
Load image into Gallery viewer, Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004 – rendered left view
Load image into Gallery viewer, Honda CB750 DOHC 1ST oversize piston ring set +0.25mm 13021-425-004 – rendered right view

1979-83 Honda CB750 DOHC Piston Ring Set ~ 1st Oversize +0.25mm

05-7501
$24.95 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
1979-83 Honda CB750 DOHC Piston Ring Set ~ 1st Oversize +0.25mm
$24.95 USD
Description

Run a 0.25mm oversize on your DOHC CB750 with this 1st Oversize Piston Ring Set (+0.25mm), Japanese made to superior quality and replacing OEM Ref. #13021-425-004. Fits the late-'70s and early-'80s DOHC CB750 range plus the Nighthawk.

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 #13021-425-004
• Japanese made, superior quality
• One piston per set (4 sets for full rebuild)
• Honda part name: Ring Set, Piston (Os 0.25) (Riken)
• Interchangeable with Honda 13021-425-003

Fitment / Compatibility

• Honda CB750K (1979‑82)
• CB750F (1979‑82) Supersport
• CB750C (1980‑82) Custom
• CB750L (1979) Limited

• Honda CB750SC (1982‑83)

Part Number: 05-7501

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

Make Model Year
Honda CB750K Standard 1979
Honda CB750F Supersport 1979
Honda CB750L Limited 1979
Honda CB750K 1980
Honda CB750F 1980
Honda CB750C Custom 1980
Honda CB750K 1981
Honda CB750F 1981
Honda CB750C 1981
Honda CB750K 1982
Honda CB750F 1982
Honda CB750C 1982
Honda CB750SC Nighthawk 1982
Honda CB750SC 1983

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 DOHC Honda CB750 piston ring sets are required?

One Japanese-made ring set replacing Honda OEM 13021-425-004 services one piston. Four sets are required to re-ring all four pistons in a DOHC CB750 engine.

What does first oversize +0.25 mm mean for CB750 piston rings?

The rings are made for a cylinder bored and finished 0.25 mm over standard and a matching +0.25 mm piston. They are not a wear-compensation substitute for standard rings in an unmachined standard bore.

Which Honda CB750 models accept the +0.25 mm DOHC ring set?

It fits matching first-oversize applications on 1979-1982 CB750K and CB750F, 1980-1982 CB750C, 1979 CB750L, and 1982-1983 CB750SC models.

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