Look at the intake arrangement on your 1981 CB900C Custom before choosing a filter. The stock-type element serves the original airbox. The black 54mm pod is an individually supplied clamp-on option that needs a measured carburetor inlet and enough space around the complete fitted assembly.
1979 Honda CB750F Motorcycle Parts1979 Honda CB750K Motorcycle Parts1979 Honda CB750L Motorcycle Parts1980 Honda CB750C Motorcycle Parts1980 Honda CB750F Motorcycle Parts1980 Honda CB750K Motorcycle Parts1980 Honda CB900C Motorcycle Parts1981 Honda CB750C Motorcycle Parts1981 Honda CB750F Motorcycle Parts1981 Honda CB750K Motorcycle Parts1981 Honda CB900C Motorcycle Parts1981 Honda CB900F Motorcycle Parts1982 Honda CB750C Motorcycle Parts1982 Honda CB750F Motorcycle Parts1982 Honda CB750K Motorcycle Parts1982 Honda CB750SC Motorcycle Parts1982 Honda CB900C Motorcycle Parts1982 Honda CB900F Motorcycle Parts1983 Honda CB1000C Motorcycle Parts1983 Honda CB1100F Motorcycle Parts1983 Honda CB750SC Motorcycle PartsHonda CB Air Filters, Pod Filters & BreathersHonda CB Fuel System & Carburetor PartsHonda CB1000 Motorcycle Parts by Model & YearHonda CB750 DOHC Parts (1979–1982)Honda CB750 Motorcycle Parts by Model & YearHonda CB750C Custom Motorcycle Parts (1980–1982)Honda CB750F Motorcycle Parts (1975–1982)Honda CB750K Motorcycle Parts (1969–1982)Honda CB750SC Nighthawk Motorcycle Parts (1982–1986)Honda CB900 Motorcycle Parts by Model & YearHonda CB900C Custom Motorcycle Parts (1980–1982)Honda CB900F Supersport Motorcycle Parts (1981–1982)Series 3: CB700-750SC (82-86)Series 4: CB900-1100 (80-83)
Replace your DOHC CB's stock air filter with this Stock-Type Air Filter, replacing OEM #17211-425-000. Fits the 1979-82 CB750 family, CB750SC Nighthawk, CB900 family,...
Inspect the 1981 airbox and nearby fuel-control hose routing
The CB900C’s original airbox uses one shared element feeding four carburetors. A clamp-on pod changes that arrangement. Inspect the housing, boots and breather connections as well as the visible filter; a new element cannot repair a cracked airbox or poor connection.
Honda’s service procedure removes the cover and element-retaining spring, then checks the element for dirt or damage. Make sure those pieces and the carburetor boots are present and seated correctly. Use the replacement filter’s own care instructions rather than assuming a paper element should be washed or oiled like a pod.
Treat pods as a complete intake change
The black 54mm pod is an individual clamp-on filter, supplied dry. Confirm the inlet outside diameter and clearance, then account for the breather system and the 1981 fuel-line diaphragm’s vacuum and vent connections. An intake change must leave those separate systems correctly connected and calls for a running assessment.
Buying questions
Does a 32mm carburetor require a 32mm pod filter?
No. Honda’s 32mm figure describes the original carburetor venturi. A pod clamps around the outside of the air inlet. Measure that outside diameter and check the filter’s mounting depth and surrounding clearance before ordering.
Can a dirty air filter cause rich running?
Yes. Honda lists a dirty air cleaner among rich-mixture causes. Inspect and service the filter and airbox first, while also checking choke operation; do not compensate for a restriction by changing jets before diagnosing it.
What else should be checked during air-filter service?
Inspect the airbox cover, retaining spring, boots and breather hoses. Honda also calls for draining deposits from the breather drain tube and replacing its plug. Keep those connections correct when repairing the original intake or assessing a conversion.
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