Originally Posted by wee-twin
Use a socket or wrench, preferably six point. Do not use a open end wrench. A little heat on the area around the caps should cause expansion and they should break free. Silver neverseize on the threads upon reassembly.
Neither will fit or work in this case. Thread seizure isn't the issue, it's flooded with oil back there. It's the design of the plug. They did that since new when overtorqued (most all were)
Too much is just barely enough.....
2007 Tiger 1050
2005 Royal Star Tour DeLuxe
1973 Yamaha TX750
1974 Norton 850 Commando Roadster