A leak at the valve cover needs a different part from a worn shaft seal. For the 1979 CB650, identify the leaking joint first, then choose the individual gasket or seal that matches the location and the work being done.
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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...
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Stop top-end oil weeps with this Cam Cover Seal, a direct replacement for OEM #90541-422-000. Fits select 1979 CB750, CB900, and CB650 models, sealing...
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 /...
Valve-cover, alternator-cover, cylinder-head and base gaskets have separate applications. Shaft seals are another component type, so build the order from the specific joints and shafts involved in the repair.
For a valve-cover or alternator-cover repair, start with the gasket for that cover. A cylinder-head or base gasket belongs to a different joint and a more involved repair. The linked individual options let you avoid treating every oil leak as a complete overhaul.
Check seals by position
The linked shift-shaft seal measures 12.5 × 25 × 8. Dimensions help distinguish it from other engine seals, but the shaft position still matters. Have the correct service procedure and inspect the mating surfaces before choosing the replacement.
Buying questions
What should I inspect 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 replacement. The leaking seal’s position and dimensions still need to match the part you order.
Are valve-cover and head gaskets interchangeable?
No. They seal different joints. Select the cylinder-cover gasket for that cover, or the cylinder-head gasket when the head is being removed, using the repair plan and parts diagram.
Should I order a gasket set for one cover leak?
An individual gasket may cover a limited repair. Compare the joint you will open with the set contents before ordering; a larger package is useful only when it contains the parts your job needs.
Not sure which part you need?
Send your model and year, plus photos of your existing part and any changes to the original setup.