I also use the Mugen aluminium clutch with 1mm springs and the 063 pipe. I can't complain about bottom end, really. Watch [link=http://www.snviper.ch.vu]my videos[/link] to see the insane power it puts out. I do have gas mileage problems too though. I'll try a smaller carb inlet at the next race, and maybe it won't run out of fuel 1 meter before the finish line again. []

PS: JP Engines are made by Novarossi as well.