Before ordering sealing parts for the 1980 CB650C, locate the leak and identify the joint being opened. A cylinder-cover gasket, shaft oil seal and overhaul gasket set are separate choices. Matching the repair keeps a small cover job from becoming an unnecessary full kit.
1969 Honda CB750K Motorcycle Parts1970 Honda CB750K Motorcycle Parts1971 Honda CB500K Four Motorcycle Parts1971 Honda CB750K Motorcycle Parts1972 Honda CB500K Four Motorcycle Parts1972 Honda CB750K Motorcycle Parts1973 Honda CB125S0 Motorcycle Parts1973 Honda CB500K Four Motorcycle Parts1973 Honda CB750K Motorcycle Parts1974 Honda CB125S1 Motorcycle Parts1974 Honda CB550K Motorcycle Parts1974 Honda CB750K Motorcycle Parts1975 Honda CB125S2 Motorcycle Parts1975 Honda CB550F Supersport Motorcycle Parts1975 Honda CB550K Motorcycle Parts1975 Honda CB750F Motorcycle Parts1975 Honda CB750K Motorcycle Parts1976 Honda CB125S3 Motorcycle Parts1976 Honda CB550F Supersport Motorcycle Parts1976 Honda CB550K Motorcycle Parts1976 Honda CB750A Motorcycle Parts1976 Honda CB750F Motorcycle Parts1976 Honda CB750K Motorcycle Parts1977 Honda CB550F Supersport Motorcycle Parts1977 Honda CB550K Motorcycle Parts1977 Honda CB750A Motorcycle Parts1977 Honda CB750F Motorcycle Parts1977 Honda CB750K Motorcycle Parts1978 Honda CB550K Motorcycle Parts1978 Honda CB750A Motorcycle Parts1978 Honda CB750F Motorcycle Parts1978 Honda CB750K Motorcycle Parts1979 Honda CB650 Motorcycle Parts1980 Honda CB650 Motorcycle Parts1980 Honda CB650C Custom Motorcycle Parts1981 Honda CB650 Motorcycle Parts1981 Honda CB650C Custom Motorcycle Parts1982 Honda CB650 Motorcycle Parts1982 Honda CB650SC Nighthawk Motorcycle PartsHonda CB Engine Gaskets, Oil Seals & HardwareHonda CB Engine PartsHonda CB125 Motorcycle Parts by Model & YearHonda CB125S Motorcycle Parts (1973–1985)Honda CB500 Motorcycle Parts by Model & YearHonda CB500K Motorcycle Parts (1971–1973)Honda CB550 Motorcycle Parts by Model & YearHonda CB550F Motorcycle Parts (1975–1977)Honda CB550K Motorcycle Parts (1974–1978)Honda CB650 Motorcycle Parts (1979–1982)Honda CB650 Motorcycle Parts by Model & YearHonda CB650C Custom Motorcycle Parts (1980–1981)Honda CB650SC Nighthawk Motorcycle Parts (1982–1985)Honda CB750 Motorcycle Parts by Model & YearHonda CB750 SOHC Parts (1969–1978)Honda CB750A Hondamatic Motorcycle Parts (1976–1978)Honda CB750F Motorcycle Parts (1975–1982)Honda CB750K Motorcycle Parts (1969–1982)Series 10: CB72-CB250 (59-85)Series 5: CB650 (79-82)Series 6: CB500-CB550 (71-78)
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...
1971 Honda CB500K Four Motorcycle Parts1972 Honda CB500K Four Motorcycle Parts1973 Honda CB500K Four Motorcycle Parts1974 Honda CB550K Motorcycle Parts1975 Honda CB550F Supersport Motorcycle Parts1975 Honda CB550K Motorcycle Parts1976 Honda CB550F Supersport Motorcycle Parts1976 Honda CB550K Motorcycle Parts1977 Honda CB550F Supersport Motorcycle Parts1977 Honda CB550K Motorcycle Parts1978 Honda CB550K Motorcycle Parts1979 Honda CB650 Motorcycle Parts1980 Honda CB650 Motorcycle Parts1980 Honda CB650C Custom Motorcycle Parts1981 Honda CB650 Motorcycle Parts1981 Honda CB650C Custom Motorcycle Parts1982 Honda CB650 Motorcycle Parts1982 Honda CB650SC Nighthawk Motorcycle PartsHonda CB Engine Gaskets, Oil Seals & HardwareHonda CB Engine PartsHonda CB500 Motorcycle Parts by Model & YearHonda CB500K Motorcycle Parts (1971–1973)Honda CB550 Motorcycle Parts by Model & YearHonda CB550F Motorcycle Parts (1975–1977)Honda CB550K Motorcycle Parts (1974–1978)Honda CB650 Motorcycle Parts (1979–1982)Honda CB650 Motorcycle Parts by Model & YearHonda CB650C Custom Motorcycle Parts (1980–1981)Honda CB650SC Nighthawk Motorcycle Parts (1982–1985)Series 5: CB650 (79-82)Series 6: CB500-CB550 (71-78)
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 /...
The dedicated valve cover gasket is a focused repair option. The seven-piece oil seal kit covers a different type of sealing work, so compare the kit with the dismantled engine before adding individual seals.
Flat cover gaskets and shaft seals are not interchangeable. The CB650C valve cover gasket uses reference 12391-460-770, while the separate shift-shaft seal is listed at 12.5 × 25 × 8. Identify the actual source of the leak before choosing either type.
Compare packages before adding extras
The oil seal kit contains seven pieces. The overhaul and top-end gasket products have broader names without a full written list of contents, so do not assume they include every seal or small rubber needed for your particular teardown.
Engine Gaskets & Seals questions
Is the seven-piece seal kit a gasket set?
No. It is sold as an engine oil seal kit. Cover, cylinder-head and cylinder-base gaskets are separate product types; choose them according to the joints opened during the repair.
Can I select a crank seal from the model name alone?
Match its position, reference and dimensions. The separate crank-seal listing specifies 30 × 42 × 8 and warns that some engines use different crank seals; compare the removed part.
What if I only need the valve cover gasket?
The dedicated cylinder-cover gasket is available separately. Use that repair scope to decide whether a broader package is useful rather than assuming an overhaul set is needed for one cover.
Not sure which part you need?
Send your model and year, plus photos of your existing part and any changes to the original setup.