TRAIL RIDER in the U.S. tested WR360 with jetting set by distrbutor at...430 main, 35 pilot, 6AEJ164 needle with clip in #4 slot, air screw set at 1.5 turns out. Test took place with temps -7c to 20c. they said power was explosive and that in top gear tapped out, rear wheel traction was the limiting factor not power(81.9 mph with stock 15/48 gearing). I know these temps are low for Oz, but its a place to start. They said that even in this range of temps they never changed a plug.
Norman