1981 Honda CB650C Custom — Joints et quincaillerie moteur
A gasket order for the 1981 CB650C Custom should follow the engine joints you plan to disturb. The cylinder-cover gasket, sleeve O-rings and shift-shaft seal have separate locations and package details. Compare the old parts before adding a larger sealing kit.
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Replace your cylinder sleeve O-rings with this Cylinder Sleeve O-Ring Set of 4, replacing OEM #91304-286-000.Key Features• Cylinder sleeve O-rings, 4 per set• Replaces...
Replace your CB650 cylinder head gasket with this Cylinder Head Gasket, replacing OEM #12251-426-306.Key Features• Cylinder head gasket• Replaces OEM #12251-426-306Fitment / Compatibility• All...
Rebuild your CB650 engine with this Athena Overhaul Engine Gasket Set. Athena of Italy is an original-equipment supplier to Yamaha, Honda, Kawasaki, Suzuki, and...
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Replace your CB650 or CB500/CB550 cylinder base gasket with this Cylinder Base Gasket, replacing OEM #12191-426-306.Key Features• Cylinder base gasket• Replaces OEM #12191-426-306Fitment /...
A cover gasket, four sleeve O-rings and a dimensioned shaft seal are distinct service choices. Their shared model application does not make their materials, profiles or installation locations interchangeable.
The cylinder cover uses reference 12391-460-770; the sleeve O-ring set uses 91304-286-000. Keep those references tied to their actual positions. Inspect mating surfaces and related components using the service manual before deciding which sealing parts to renew.
Check broader sets against the teardown
The seven-piece oil seal kit and the available overhaul gasket sets serve wider repair scopes. Their package names do not provide every detail of the planned job. Compare confirmed contents with the opened joints so individual parts are neither missed nor duplicated.
Gaskets & Engine Seals questions
What should be inspected before replacing a leaking shift-shaft seal?
Check for shaft play, wear grooves, crankcase pressure or a blocked breather, and correct any problem before fitting the new seal. A correctly sized replacement still needs a sound shaft and the cause of the leak addressed.
How do I match the shift-shaft seal before ordering?
The selected seal is specified at 12.5 × 25 × 8 and replaces 91204-425-003. Compare the shaft position, old seal and reference before choosing the replacement for the actual engine.
What if the engine has been replaced?
Identify the fitted engine and the particular cover or shaft position before choosing parts. The frame’s 1981 Custom identity cannot verify every component of a replacement engine.
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