From inside (document excerpt):
10 SPORT ATV EXTREME ACTION SPORTS HEROES 10 Adrenaline. It courses through you. Invigorates you, whether you’re streaking across sand, dirt, rocks or mud or through forests and streams. Whether you’re racking up victories on the YFZ®450R or new YFZ®450X, defying categories and obstacles on a Wolverine, or squeezing the most fun from the tightest trails on a Raptor® 90, you feel truly, undeniably alive. With the most technologically advanced, envelope-pushing, trophy-collecting machines anywhere, Yamaha puts you on top of the world.
Brochure Free Download. Operator’s Motorcycle Cataolg Guide. Free Motorcycle and Catalogue Download PDF. Years covered by this manual: 2010.
Whichever part of the world you happen to be on. Professional riders dePicted on a closed course. atVs with engines 90cc or greater are recommended for use only by riders age 16 years and older. Nothing short of the ultimate MX racing machine, the YFZ®450R has it all–from a hard-hitting 449cc engine to a true long-travel, race-spec suspension. After all, in the ultra-competitive world of ATV motocross, great power output doesn’t mean jack without superior handling. The 2010 YFZ450R delivers both in spades. Add fuel injection, an aluminum hybrid frame and a wide MX-inspired stance, and the only thing missing is your podium speech. THE DIFFERENCE BETWEEN RACING. AND WINNING. 10 YFZ450R : MASSIVE MIDRANGE: Fuel-injected five-valve engine’s camshafts and exhaust are tuned to boost low- and midrange power for arm-straightening drive out of corners. : INCREDIBLE PERFORMANCE: A compression ratio of 11.6:1 and optimizing port shapes help the YFZ450R make maximum power. Stout bearings and connecting rod add even more strength and reliability. : ALUMINUM FRAME: Light and strong, no-weld cast aluminum mainframe provides a solid attachment point for the YFZ450R’s front and rear suspension systems. And a wide track helps the YFZ450R achieve amazingly flat and precise cornering. : WINNING ERGOS: An adjustable ProTaper® handlebar, low-effort throttle and wide footpegs put the rider in command of this race-ready machine. Team Yamaha Blue/White Red/White Midnight Blue (Special Edition) A PROFESSIONAL SUSPENSION 9.8 inches of front wheel travel, controlled by 44mm fully adjustable KYB shocks with Kashima coating, means precise handling and a smooth ride. b HARD-HITTING POWER Fuel-injected, five-valve engine fed by a 42mm throttle body packs even more power down low and in the midrange, for monstrous corner exits. c WELDLESS ALUMINUM FRAME Hybrid frame made up of aluminum rails and a steel lower section is carefully tuned for minimum weight, maximum durability and the next level of handling performance. A To learn more about the YFZ450R, go to YAMAHA-MOTOR.COM b c the yfZ450r is recommended for use only by riders age 16 years and older. Professional rider with adVanced skill dePicted on a closed course. yfZ450r shown with aftermarket Parts. 10 Especially when you’re racing in the woods. Enter the all-new YFZ®450X. All the devastating, fuel-injected power and laser-sharp handling of the YFZ450R, but in a narrower package designed especially for conquering the tight trails. So now you can blast around trees, stumps, logs or anything else that crosses your path. And with five straight GNCC titles in its bloodline, the only question is, why would you race anything else? SOMETIMES WINNING COMES DOWN TO THE NARROWEST OF MARGINS. YFZ45 0 X : POWER TO BURN .THE COMPETITION: Ultra-powerful 449cc engine features titanium five-valve cylinder head technology, with a camshaft designed to deliver abundant low- to midrange torque for performance where you can really use it to take the lead while still maintaining a super-strong top end to let you pull away from the pack. : SUPERIOR POWER DELIVERY: Fuel injection uses a 12-hole injector that provides exceptional atomization of the fuel for maximum combustion efficiency and power delivery. The system also uses a big, 42mm Mikuni ® throttle body and includes ISC (Idle Speed Control) for easy, reliable start-up and warming.
Wikipedia’s page for Yamaha Motorcycles