From what I understand the Kawasaki clutch has two different hardness of rubbers. The soft ones are what usually break up and the harder ones get too hard from heat and oil and they cause the knock. By using the hose it is softer than the remaining hard rubbers and gives some movement before the hard ones contact. I thought of using silicone hose too, but the sizes were wrong. Total cost for hose and rivets was about $4.00, and two hours of my time.