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I've had Yoshimura systems on all 3 of my race bikes and have never lost a spring ever, with my 1st bike having something like 6000 race miles on it. None of those systems had any type of sleeve around the springs, they used just the spring itself.
Are you sure your systems didn't come with the rubber sleeves? All my Yosh systems did, they are grey and have the little Yosh japanise logo molded into them.
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