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17210-323-pow Powerfilter 39mm Tapered CB500f and CB550f (4x)
Perfect fit for CB350f and CB400f!

Connection diameter 39mm, total lenght 68mm (including mounting rubber), conus diameter 61mm. Please order only if these sizes fit your motorcycle.

39mm is the fitting diameter on the inletside of the carburettor.
Increase mainjet with plm 10%!