SOHC.co.uk Forums > CB350/400

airbox/carb and carb/manifold rubbers

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Mikep328:
In past projects I tried wintergreen oil and several other liquids/combinations that can allegedly soften old rubber.  I found that while wintergreen worked initially, a week (or less) later the rubber was a hard as it was prior to treatment.  So my experience - admittedly with "commonly available" items - was that "restoring" rubber parts  made them flexible enough to be re-attached/re-mounted but they returned rather quickly to their hardened state. 

On the good side, if you don't plan to regularly remover/re-attach the particular rubber part, temporary softening might be all you need. 

AshimotoK0:

--- Quote from: Mikep328 on October 02, 2023, 07:27:59 AM ---In past projects I tried wintergreen oil and several other liquids/combinations that can allegedly soften old rubber.  I found that while wintergreen worked initially, a week (or less) later the rubber was a hard as it was prior to treatment.  So my experience - admittedly with "commonly available" items - was that "restoring" rubber parts  made them flexible enough to be re-attached/re-mounted but they returned rather quickly to their hardened state. 

On the good side, if you don't plan to regularly remover/re-attach the particular rubber part, temporary softening might be all you need.

--- End quote ---

Parts I have softened with Reofos 50 over ten years ago are still as soft as when I forst treated them BUT that's not on a bike being exposed to fuel.

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