Made from resistant high quality material, our Koso chain tensioner with bearing could save your engine from expensive damage. We came up with this long lasting solution to replace the OEM chain tensioner which has a tendency to wear prematurely
The arm is made with Aluminum 6061, and the wheel is made with JIS SCM415 (=SAE 4115) Alloy Structure Steel (Chromium Molybdenum Steel). Works on stock engine and highly recommended to use with our Big Bore & 4V Head kit.
