Considering the overhaul Yamaha gave the WR models last year, it's not surprising to see only modest refinements to the off-road duo for 2006. While the '06 machines aren't radically different, a few key upgrades are sure to make them more versatile. One new feature we are definitely excited to see is the AIS on the WR250F—the same system the 450 received in 2005—making it green sticker legal. Californians can appreciate that now more than ever as we head into the doldroms of red sticker season.What else is new? Both WRs feature a new on-board digital enduro computer. In standard mode, it functions as a clock, speedometer and tripmeter, and in race mode it measures average speed, works as a timer and a distance-compensating tripmeter.The '06s received new front suspension as well. The 48mm fork features new "ultra-sensitive" compression circuitry for what Yamaha promises to be an even smoother ride. We haven't received much information on the new WR fork, but watch for the full scoop in the pages of Dirt Rider.New seat foam, a reinforced swingarm and new two-position handlebar clamps top off the list of changes to the 2006 WR.All-new TT-R50A brand new model to hit the line-up this year is Yamaha's TT-R50E. It's not replacing the two-stroke PW50, but adding another option to the blue line-up, and a direct competitor to Honda's ever-popular CRF50F. The little smurf is noteably similar to the CRF with a 49cc four-stroke air-cooled engine, three-speed auto clutch and nearly identical seat height (just under 22 inches).