Not sure on your bike but the ktms have a couple unused bungs in the frame that an m8 threads right into near the head stock, I hit one with some sand paper and then an extra ground strap off the battery. I thought most radiators are rubber mounted to the frame so not a good ground. 2 other options, the bolt mounting the rad to the frame/rad brackets or run a ground wire from the battery. I would do the latter and fix it to the frame and qs up front. An extra ground strap is a good thing.