Honda-SOHC

SOHC.co.uk Forums => CB500/550 => Topic started by: Peterplank on February 08, 2026, 04:16:58 PM

Title: Airbox rubber Seal
Post by: Peterplank on February 08, 2026, 04:16:58 PM

Hello all,
At the point of putting carbs back on after rebuild and finding more to do of course..

I'm looking for a replacement rubber seal that goes between the 2 black main airbox parts, can anyone point me in the right direction please ?

The main box not the air filter itself

I can't see it on the David Silver or cmsnl drawings...

 :)

Title: Re: Airbox rubber Seal
Post by: Bryanj on February 08, 2026, 04:44:29 PM

Thats because it was never a seperate part, i think it comes with the plenum chamber

Title: Re: Airbox rubber Seal
Post by: Peterplank on February 08, 2026, 05:54:50 PM

Ah ok, that explains it...
Hot soapy water it is then  :)

Title: Re: Airbox rubber Seal
Post by: deltarider on February 09, 2026, 11:54:21 AM

Could a part cut out of a pedalbike's inner tube help you?

Title: Re: Airbox rubber Seal
Post by: Oddjob on February 09, 2026, 04:23:17 PM

IIRC the seal used to clip onto the rim of the plenum chamber. It’s like the letter U. Honda used a very similar sort of seal on the edge of the seat pan to stop the pan from cutting into the cover. Surely something similar can be found online. Other that that some stick on foam should do the job, it’s only stopping any unfiltered air from getting into the intake.

Title: Re: Airbox rubber Seal
Post by: Johnwebley on February 10, 2026, 08:37:15 AM

You could try using fuel tubing,
Slit it open, the see how it fits,

Might need to experiment with different sizes

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