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CB500/550 / Re: top end gasket set recomendations
« Last post by davidcumbria on May 10, 2024, 06:19:58 PM »This might help you a bit. I fitted the the 2.5 mm thick 90 hardness rings after reading this and they've been fine
https://www.sohc.co.uk/index.php/topic,28673.0.html
https://www.sohc.co.uk/index.php/topic,28673.0.html