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I see that Motobins are flogging Spanish Betor shock absorbers. I remember the beggars well as they came fitted to the Bultaco Metralla I raced in production races a very, very long time ago and was stuck with under the class rules.The saying went that Betors are better than nothing, but not by much. It is a very long time ago but my memory tells me that Boges were better than Betors.BUT, joy OH joy, Betors are rebuildable and they use (or at least they used to use) catalog seals. So once you pulled them apart, played with the valving, fiddled with fluid quantity and weight, you could actually turn them into decent shocks.
...I think the guys exaggerated to make a point about the Boge shocks. None of the period road tests seemed to think they were that terrible.