I see some people have used the boiling water and Winter green oil, but I didnt fancy it.
Found a tip to use Xylene and concentrated Winter Green oil mix.
Winter green is the more expensive, but bought 500ml and 5ltr Xylene for about £30.
Not economic if you only have a a few rubbers to do, but as I have quite a few decided to give it a try.
You need to be quite careful in handling these chemicals and use recommended protective clothing, ventilation, gloves etc.
I mixed at ratio of about 5 parts Xylene to 1 part WG oil in a medium sized pickle jar with lid.
First tried on inlet rubbers.
The rubbers were rock hard, but swell up after soaking for a day or too, but dont leave too long.
It seems to work by the Xylene swelling rubber and WG oil then soaking into rubber to maintain flexibility.
Took a while for xylene to evaporate off after removed from mix and rubbers returned to normal size and now quite pliable.
Then tried with a small batch of rubbers including the unobtainable CB750F1 rear seat cowl rubber buffers.
With many of small mounting rubbers at £3 odd each and some rubbers unobtainable, may be of interest.
If the rubber has perished and cracked, this method will not restore.
