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1981 Honda CB900C Custom Airbox & Pod Filters

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.

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Currently viewing Air Filters, Vent Filters

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Honda CB1100 CB1000 CB900 CB750 stock type air filter 17211-425-000

Honda CB1100 / CB1000 / CB900 / CB750 Stock Type Air Filter ~ Replaces 17211-425-000

$19.95 USD
15-0069
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,...
Honda CB1000 CB900 CB750 round pod air filter black red

Honda CB1000 / CB900 / CB750 Round Pod Air Filter ~ Black/Red

$26.95 USD
15-0021
Fit performance pod filters on your DOHC CB with this 54mm Round Pod Air Filter with black body and red foam filter. Same circular...
Honda CB1000 CB900 CB750 round pod air filter

Honda CB1000 / CB900 / CB750 Round Pod Air Filter

$19.95 USD
15-0037
54mm round pods with a chrome end cap to your DOHC CB with this 54mm Round Pod Air Filter. Same circular style as the...
Honda CB 54mm black round pod air filter

54mm Round Pod Air Filter with Black End Cap

$24.95 USD
15-0169
Replace worn, damaged or restrictive clamp-on filters with this aftermarket 54mm round pod air filter. The black end cap gives the filter a darker...
Honda CB1100F CB1000C CB900C CB900F oval pod air filter

Honda CB1100 / CB1000 / CB900 Oval Pod Air Filter

$24.95 USD
15-0035
Fit larger oval pods to your DOHC CB with this 54mm Tapered Oval Pod Filter with chrome end cap. Sized for 1980-84 stock Mikuni...
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1981 Honda CB900C Custom · Airbox & Pod Filters Buying guide

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.

Parts to consider

Honda CB1100 / CB1000 / CB900 / CB750 Stock Type Air Filter ~ Replaces 17211-425-000 Stock-airbox filterReplacement filter for the original-type airbox; reference 17211-425-000.View part 54mm Round Pod Air Filter with Black End Cap Black 54mm pod filterIndividual washable clamp-on filter, supplied dry; confirm inlet diameter and surrounding clearance.View part

Restore the complete original-airbox seal

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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