Suzuki's all-new RM-Z450 four-stroke MX machine made its racing debut at the final round of the All-Japan MX Championship series with All-Japan 250 MX champ Akira Narita at the helm.The Team Suzuki rider is still coming to terms with the new four-stroke, but turned in the second fastest lap of the day recovering froma fall in the first moto, but fell again towards the end of the race and finished out of the points. In the second moto, Narita's inexperience with the new bike showed as he put in a fifth place finish.Afterwards Narita said, "It was just my second ride on the machine today. I didn't really have enough time on the new RM-Z450 to learn the differences between the two-stroke and four-stroke, but the new bike has massive power, even at low revs and handled really well once I got used to the different characteristics. I think we showed that the new machine will be a serious threat next year and Suzuki will use the winter period to make it into a race winner."Also spotted in the pits by eagle-eyed photographer Shogo Motobayashi was a possible aluminum framed 2005 Yamaha YZ125. The frame is reminiscent of the aluminum framed works YZ450Fs on the European MXGP circuit. But will we see it in America?