Count the exhaust joints you will open on your 1980 CB900C Custom before ordering gaskets and studs. The gasket is supplied individually. The fastening package lists eight studs and eight flange nuts, so its contents should not be mistaken for eight total pieces.
Replace one exhaust port gasket on your CB750 or big-bore DOHC CB with this Exhaust Port Gasket, 1 piece, replacing OEM #18291-254-000 / #18291-MM5-860....
1967 Honda CL450K0 Motorcycle Parts1968 Honda CB350K0 Motorcycle Parts1969 Honda CB175K3 Motorcycle Parts1969 Honda CB750K Motorcycle Parts1969 Honda CL450K2 Motorcycle Parts1970 Honda CB100K0 Motorcycle Parts1970 Honda CB175K4 Motorcycle Parts1970 Honda CB350K2 Motorcycle Parts1970 Honda CB450K Motorcycle Parts1970 Honda CB750K Motorcycle Parts1970 Honda SL350K0 Motorcycle Parts1971 Honda CB100K1 Motorcycle Parts1971 Honda CB175K1 Motorcycle Parts1971 Honda CB350K3 Motorcycle Parts1971 Honda CB450K Motorcycle Parts1971 Honda CB500K Four Motorcycle Parts1971 Honda CB750K Motorcycle Parts1972 Honda CB100K2 Motorcycle Parts1972 Honda CB175K6 Motorcycle Parts1972 Honda CB350K4 Motorcycle Parts1972 Honda CB450K Motorcycle Parts1972 Honda CB500K Four Motorcycle Parts1972 Honda CB750K Motorcycle Parts1973 Honda CB125S0 Motorcycle Parts1973 Honda CB175K7 Motorcycle Parts1973 Honda CB350G Motorcycle Parts1973 Honda CB500K Four Motorcycle Parts1973 Honda CB750K Motorcycle Parts1974 Honda CB125S1 Motorcycle Parts1974 Honda CB200 Motorcycle Parts1974 Honda CB550K Motorcycle Parts1974 Honda CB750K Motorcycle Parts1974 Honda CL360K0 Motorcycle Parts1975 Honda CB125S2 Motorcycle Parts1975 Honda CB200T Motorcycle Parts1975 Honda CB400F Motorcycle Parts1975 Honda CB500T Twin Motorcycle Parts1975 Honda CB550F Supersport Motorcycle Parts1975 Honda CB550K Motorcycle Parts1975 Honda CB750K Motorcycle Parts1975 Honda CL360K1 Motorcycle Parts1976 Honda CB200TK0 Motorcycle Parts1976 Honda CB400F Motorcycle Parts1976 Honda CB500T Twin Motorcycle Parts1976 Honda CB550F Supersport Motorcycle Parts1976 Honda CB550K Motorcycle Parts1976 Honda CB750A Motorcycle Parts1976 Honda CB750K Motorcycle Parts1977 Honda CB400F Motorcycle Parts1977 Honda CB550F Supersport Motorcycle Parts1977 Honda CB550K Motorcycle Parts1977 Honda CB750A 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 Parts1979 Honda CB750F Motorcycle Parts1979 Honda CB750K Motorcycle Parts1979 Honda CB750L Motorcycle Parts1980 Honda CB650 Motorcycle Parts1980 Honda CB650C Custom Motorcycle Parts1980 Honda CB750F Motorcycle Parts1980 Honda CB750K Motorcycle Parts1980 Honda CB900C Motorcycle Parts1981 Honda CB650 Motorcycle Parts1981 Honda CB650C Custom Motorcycle Parts1981 Honda CB750F Motorcycle Parts1981 Honda CB750K Motorcycle Parts1981 Honda CB900C Motorcycle Parts1981 Honda CB900F Motorcycle Parts1982 Honda CB650 Motorcycle Parts1982 Honda CB650SC Nighthawk Motorcycle Parts1982 Honda CB750F Motorcycle Parts1982 Honda CB750K Motorcycle Parts1982 Honda CB900C Motorcycle Parts1982 Honda CB900F Motorcycle Parts1983 Honda CB1100F Motorcycle Parts1994 Honda CB1000 Motorcycle Parts1995 Honda CB1000 Motorcycle PartsHonda CB Exhaust Gaskets & Mounting HardwareHonda CB Exhaust Systems, Mufflers & HardwareHonda CB Foot Pegs, Shifters, Kickstarters & StandsHonda CB Frame & Body PartsHonda CB Rubber Components & Mounting DampersHonda CB100 Motorcycle Parts by Model & YearHonda CB1000 Motorcycle Parts by Model & YearHonda CB100K Motorcycle Parts (1970–1972)Honda CB125 Motorcycle Parts by Model & YearHonda CB125S Motorcycle Parts (1973–1985)Honda CB175K Motorcycle Parts (1969–1973)Honda CB200 Motorcycle Parts by Model & YearHonda CB200T / CB200TK0 Motorcycle Parts (1975–1976)Honda CB350 Motorcycle Parts by Model & YearHonda CB350K Motorcycle Parts (1968–1972)Honda CB400 Motorcycle Parts by Model & YearHonda CB400F Motorcycle Parts (1975–1977)Honda CB450 Motorcycle Parts by Model & YearHonda CB450K Motorcycle Parts (1965–1974)Honda CB500 Motorcycle Parts by Model & YearHonda CB500K Motorcycle Parts (1971–1973)Honda CB500T Motorcycle Parts (1975–1976)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 DOHC Parts (1979–1982)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)Honda CB900 Motorcycle Parts by Model & YearHonda CB900C Custom Motorcycle Parts (1980–1982)Honda CB900F Supersport Motorcycle Parts (1981–1982)Honda CL360K Motorcycle Parts (1974–1975)Honda CL450K Motorcycle Parts (1967–1974)Honda SL350K Motorcycle Parts (1969–1973)Series 10: CB72-CB250 (59-85)Series 4: CB900-1100 (80-83)Series 5: CB650 (79-82)Series 6: CB500-CB550 (71-78)Series 7: CB400-CB450 (65-86)Series 8: CB350-CB400 (72-77)Series 9: CB350-CB360 (69-75)
Replace a worn kick stand stopper with this Kick Stand Stopper Rubber "A", a direct replacement for OEM #95011-61000. Exceptionally broad fitment across the...
Replace one cylinder-head-to-exhaust-headpipe gasket on your big-bore Honda with this Cylinder Head to Exhaust Headpipe Gasket, 1 piece, replacing OEM #18291-MM5-860. Exceptionally broad fitment...
1979 Honda CB750K Motorcycle Parts1980 Honda CB750K Motorcycle Parts1980 Honda CB900C Motorcycle Parts1981 Honda CB750K Motorcycle Parts1981 Honda CB900C Motorcycle Parts1981 Honda CB900F Motorcycle Parts1982 Honda CB750K Motorcycle Parts1982 Honda CB900C Motorcycle Parts1982 Honda CB900F Motorcycle PartsHonda CB Exhaust Gaskets & Mounting HardwareHonda CB Exhaust Systems, Mufflers & HardwareHonda CB750 DOHC Parts (1979–1982)Honda CB750 Motorcycle Parts by Model & YearHonda CB750K Motorcycle Parts (1969–1982)Honda CB900 Motorcycle Parts by Model & YearHonda CB900C Custom Motorcycle Parts (1980–1982)Honda CB900F Supersport Motorcycle Parts (1981–1982)Series 4: CB900-1100 (80-83)
Restore your classic Honda’s exhaust system with this premium Exhaust Stud Set, engineered for durability and a precise fit. This 8-piece kit includes eight...
Count exhaust seals separately from fastening hardware
The headpipe gasket seals the exhaust-port joint, while studs and nuts secure the assembly. Inspect both the retained pipes and the cylinder-head fastening points before finalizing the repair order.
The featured gasket is sold individually for the headpipe-to-cylinder-head port. Four are needed when all four ports are resealed. Remove each old crush gasket from a disturbed port before fitting its replacement, and inspect the seating surface rather than stacking a new gasket over the old one.
Assess fastening damage before assembly
The stud package includes eight studs and eight matching flange nuts. New hardware does not establish that damaged cylinder-head threads or pipe flanges are sound. Have those conditions assessed before assembly and use the appropriate service specifications rather than guessed tightening values.
Buying questions
Can an old port gasket be left beneath the new one?
No. Remove the old crush seal from the disturbed port and inspect the seat before fitting a fresh gasket. A compressed old ring can be easy to overlook; stacking seals is not a substitute for preparing the joint properly.
Are the exhaust joint collars the same parts as the gaskets?
No. The 18233-425-000 product is one joint half-collar, with two used at each cylinder-head pipe joint. The gasket seals inside the port. Match the missing or damaged piece before ordering either product, and inspect the studs, nuts and flanges separately.
Should I replace studs just because I replace a gasket?
Inspect their condition and the threaded mounting points first. The required hardware scope depends on that inspection; a gasket replacement alone does not establish that every stud needs renewal.
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