For a 1981 CB650C top-end repair, establish the piston size before deciding the ring quantity. The standard ring product supplies one piston’s rings. The separately listed 15mm retaining clips come in pairs and belong to the piston-pin retention rather than the ring grooves.
Secure your piston pins with this 2-pack of 15mm Piston Pin Clips, Japanese made to superior quality and replacing OEM Ref. #94601-15000. Exceptionally broad...
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Rebuild your CB650 cylinders with this Standard-Size Piston Ring Set, OEM #13011-426-004 (Std.). Japanese-made, superior quality.Note: this set includes piston rings to rebuild one...
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Upgrade or restore your classic Honda motorcycle with this Genuine Honda Piston Pin — precision‑engineered and made in Japan. This authentic replacement fits and...
Four matching one-piston ring sets are required when renewing all four standard pistons. The clip pair is a separate order item; compare its retention arrangement with the actual pistons if the engine has been rebuilt before.
Standard-size rings should be selected only after checking the bore and piston combination. A previous rebore can make the frame year irrelevant to ring size. Have wear and clearances assessed against the correct service limits before ordering the internal parts.
Keep clips separate from rings
The separate pack contains two 15mm clips, reference 94601-15000, enough for one compatible piston. Four packs supply eight clips for all four pistons. Match the retaining arrangement on any aftermarket pistons before ordering; the standard ring set does not include these clips.
Piston Rings & Clips questions
How many sets are needed for four standard pistons?
Four ring sets, because each package covers one piston. First confirm that each piston uses the listed standard specification; the quantity calculation does not establish fit.
Are oversize pistons covered by this standard set?
Choose the ring size that matches the measured piston and bore. The selected product is explicitly standard size, so it should not be treated as a general solution for a previously bored engine.
Should I replace piston-pin clips that were removed during inspection?
Yes. Removed piston-pin clips should be replaced, even when the piston or pin is reused. Confirm the 15mm size and reference 94601-15000 for the retaining arrangement. One pair serves one compatible piston; four packs supply eight clips for all four pistons.
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