1981 Honda CB900F — Tubes, ressorts, joints et soufflets de fourche
The useful sealing choices here are fork oil seals and the separate dust seals for the 1981 CB900F Supersport. Identify which sealing parts your repair needs and check the installed fork before ordering, particularly on a bike with a replacement front end.
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The original F fork is a nominal 39mm air-assisted design. The oil seals are listed at 39 × 52 × 11mm, with separate dust seals. Identify the installed fork before using those dimensions after a front-end swap.
The oil-seal set is listed for the 1981–82 CB900F and measures 39 × 52 × 11mm. A motorcycle carrying different forks should be checked against that assembly. Use the service information for the installed fork to confirm the sealing parts before ordering.
Find the leak before choosing the repair
Oil at the sliding seal and loss of fork air pressure are different faults. Honda’s F section shows oil and dust seals in the slider and O-rings at the air-hose connections. Inspect tube and bushing condition during seal service. Use the F procedure and a hand-operated pump for the air system; do not use shop compressed air.
Buying questions
Why might new fork seals leak again?
Pitted or scored tubes, worn bushings, contamination or damaged seal seating can spoil a new seal. Inspect those parts rather than replacing the rubber repeatedly. Oil on a tire or brake needs correction before the motorcycle is ridden.
Does a fork that loses air need new oil seals?
Not necessarily. The F air hoses and their connection O-rings are separate from the sliding oil seals. Identify where pressure is escaping and follow the F-specific inspection procedure. Use a hand-operated pump and the specified pressure limits, not a compressor.
Does a 1982 CB900F automatically need an anti-dive seal kit?
The original F fork illustrated in Honda’s 1981 service section, carried forward by the 1982 supplement, is the 39mm air-assisted fork without a TRAC anti-dive unit. If different legs are fitted, identify that fork directly before selecting its seals and service procedure.
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