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(didn't want to hijack the other thread, started a new topic)Good luck you can find plenty that look right but the trouble begins with with the rubber quality
Something has changed in the composition of black rubber components over the last 20 odd years I never experienced the extrusion of carbon on simple washing of the rubber surface before and my rubber trials seat cracked within a few months without being left in the sun is it the reduction of natural rubber? Any chemists out there?
I think the change in rubber goes back more than 20 years. I think by the 80's or maybe even the 70's, rubber was quite a bit different than before. My John Bull kickstart rubber on the Shadow is still the same one that was on it back in the 50's. And I have one of those John Bull accessory spark plug carriers, made back in the 50's, and even the 2 thick rubber o-ring shaped pieces that hold it together are still flexible enough to work well.