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1981 Honda CB900C Custom Piston Rebuild Parts

Determine piston and bore condition before buying rebuild parts for your 1981 CB900C Custom. Ring-only service retains the existing piston when suitable; the complete standard kit adds a new piston, pin and clips. Both options are supplied for one piston rather than the complete engine.

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Currently viewing Piston & Ring Sets

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Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000

Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000

$1.95 USD
05-7201
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...
Honda CB piston pin 13111-300-000

Honda CB Piston Pin ~ Replaces 13111-300-000

$8.95 USD
05-7200
Replace a worn or damaged piston pin with this Piston Pin, Japanese made to superior quality and replacing OEM Ref. #13111-300-000. Fits the full...
Honda CB900C CB900F piston ring set (standard size) 13011-438-004

1980-82 Honda CB900C / CB900F Piston Ring Set (Standard Size) ~ Replaces 13011-438-004

$34.95 USD
73-1023
Rebuild your CB900 cylinders with this Standard-Size Piston Ring Set, OEM #13011-438-004 (Std.). Japanese-made, superior quality.Note: this set includes piston rings to rebuild one...
Honda CB900 standard piston kit with rings 13101-438-000

1980-82 Honda CB900 Piston Kit with Rings ~ Standard Size

$74.95 USD
05-8000
Upgrade or rebuild your classic Honda motorcycle engine with this Standard Size Piston Kit — complete with piston, piston rings, and piston pin. This...
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1981 Honda CB900C Custom · Piston Rebuild Parts Buying guide

Choose rings or complete pistons from the wear measurements

The featured complete kit and ring-only set both cover one piston. On a 1981 Custom, establish the existing bore and piston condition before deciding which option is worthwhile. A new piston of standard size still needs the correct measured clearance.

Parts to consider

1980-82 Honda CB900 Piston Kit with Rings ~ Standard Size Standard piston kitOne standard piston with rings, pin and clips; four kits cover all four pistons.View part 1980-82 Honda CB900C / CB900F Piston Ring Set (Standard Size) ~ Replaces 13011-438-004 Standard piston ring setRings for one piston; four sets are required for all four pistons.View part Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000 Piston-pin clip pairTwo Japanese-made 15mm clips; reference 94601-15000.View part

A ring-only repair keeps the existing piston

Honda’s inspection checks both the cylinder and piston, including the ring grooves and the gap of each ring in its cylinder. New rings will not repair a cracked piston, worn grooves or an out-of-limit bore. Ask the rebuilder to establish the finished size before choosing the standard ring set or standard piston kit.

Keep each cylinder’s measurements and parts together

The listed ring set covers one piston. The complete kit adds one standard piston, pin and clips. Label the cylinders and record their measurements so one good bore does not stand in for all four. The Honda procedure requires engine removal for this work, so include the disturbed head and base sealing parts in the plan.

Buying questions

Does a standard-size marking mean the old piston can be reused?

No. Inspect its skirt, pin bore and ring grooves, and measure its clearance in that cylinder. A worn standard piston remains standard in name but may be unsuitable for new rings.

Can new standard rings fix an enlarged or oval bore?

No. Measure the cylinder at several heights and in two directions. If wear or previous machining requires a different finished bore size, choose the matching piston and rings with the rebuilder rather than forcing the standard set into the repair.

What checks still matter when using a complete piston kit?

Confirm the finished bore, piston clearance and ring gaps; a kit does not remove those checks. It already includes the pin and clips for one piston, so compare the supplied contents before adding duplicate small parts or calculating the order for all four cylinders.

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Send your model and year, plus photos of your existing part and any changes to the original setup.

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