05-19-2020, 03:57 PM
back in the day my blackhawk kart had nylon inserts for bushings with a nylon washer type end. I'v taken several of these apart years later with no wear. I never had any wear the 5 years I raced a Hawk back in the '70's. Bronze bushings I've tried but they wear easily. Needle bearings need an extremely hard surface and since they don't turn very far if the surface is not hard enough they will pocket out as the rotate only in the same small area. The exception would be the radial type on the top with a hardened thrust washer on the top and bottom of the bearing. Of course If you don't run your kart a lot you may never discover all this. I've tried all these over the years. At the end of the day everyone wants to complicate a simple go kart. Drive hard-go fast-have fun!