At the company’s annual dealer convention in Las Vegas this past Sunday and Monday, Yamaha announced that its popular WR off-road bikes would receive a host of updates for 2007 — almost warranting the “all new” tag. The most noticeable change being that the WRs now feature an aluminum frame descended from those previously introduced on Yamaha’s YZ motocross machines. Below you will find Yamaha’s list of features and updates for the 2007 WR450 and WR250. California riders will no doubt appreciate the fact the new WRs are Green Sticker bikes for ’07.

2007 WR250F

Key Features:

• A YZ-bred advanced aluminum frame—carefully engineered from castings, forgings and extrusions—enhances handling while retaining legendary Yamaha feel and characteristics.
• Now there’s even more controllable power flowing from the high-revving five-titanium-valve engine—and it starts with the push of a button.
• Cool, digital enduro computer offers speedometer, clock, tripmeter, etc., in basic mode—or pace management functions such as timer, distance-compensating tripmeter, average speed, etc., when switched to race mode.
• California green sticker compliant.

Engine:

• 249cc liquid-cooled, DOHC four-stroke with 5 titanium valves delivers more low- and mid-range power than ever, with high over-rev capacity and crisp, linear throttle response.
• Revised camshafts, carburetion and TPS tuning, new exhaust and ignition systems work together to produce a quick-revving engine with even more low- and mid-range power.
• 37mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) ensures ultra-precise fuel/air mixing and lightning-quick throttle response.
• Revised transmission ratios in the five-speed gearbox-wider in 1st through 3rd, and closer in 4th and 5th.

Chassis/Suspension:

• All-new YZ-inspired aluminum frame helps reduce weight while optimizing mass centralization. An extensively tested assembly of aluminum forgings, castings and extrusions. The new WR frame retains legendary Yamaha handling and response.
• Removable aluminum rear subframe constructed of square-section tube for reduced weight.
• Fully adjustable air/oil-separate 48mm fork tubes deliver precise, fade-free handling; fork protectors provide excellent tube protection.
• Tapered swingarm adopts YZ-style linkage for controlled, compliant rear suspension action.
• Revised axle and holders reduce weight in a critical area.
• The Kayaba shock provides 12.0 inches of travel with adjusters for high- and low-speed compression damping, rebound and spring preload—and features a larger piggyback reservoir for excellent damping and fade resistance.
• New, wave disc brake rotors front and rear reduce unsprung weight and provide excellent performance. Front and rear calipers with aluminum pistons deliver strong stopping power with progressive feel.
• Lightweight 21-inch front and 18-inch rear wheels provide exceptional durability and reduced unsprung weight for optimal suspension performance.
• Premium Dunlops offer unbeatable, competition-spec traction and excellent wear.

Additional Features:

• YZ-derived bodywork, new engine covers and a thick new seat look great and feel excellent on long rides.
• ProTaper aluminum handlebar in forged triple clamp shaves weight and increases comfort.
• Wide footpegs are also lower for more comfort.
• Slim design lightweight fuel tank holds 2.1 gallons.
• One-piece, high strength, plastic skid plate shaves weight and offers great protection.
• Lightweight headlight and sweet LED taillight maximize visibility and draw less current.
• Adjustable front brake lever.
• Repackable aluminum muffler.
• Front wheel collar makes front wheel removal quick and easy.

U.S. MSRP: $6,399

2007 WR450F

Key Features:

• A YZ-bred advanced aluminum frame—carefully engineered from castings, forgings and extrusions—enhances handling while retaining legendary Yamaha feel and characteristics.
• Now there’s even more controllable power flowing from the five-titanium-valve, 11,000 rpm engine—and it starts with the push of a button.
• Cool, digital enduro computer offers speedometer, clock, tripmeter, etc. in basic mode – or pace management functions such as timer, distance-compensating tripmeter, average speed, etc. when switched to race mode.
• California green sticker compliant.

Engine:

• 449cc liquid-cooled, DOHC four-stroke with titanium valves delivers more broad power than ever, with high over-rev capacity and crisp, linear throttle response.
• Changing the cylinder mounting angle to a more vertical position in the new frame provides excellent overall machine balance.
• Revised camshafts, carburetion, intake ports, exhaust, etc., all work together to produce an engine with even more low- and mid-range power.
• New crank with revised balance factor and new AC generator provides super-smooth running. Strong new connecting rod and piston oil-jet for increased cooling and long life.
• New, dry sump lubrication system carries the oil reservoir inside the engine cases, for excellent mass centralization and simplified plumbing.
• 39mm Keihin FCR flat-slide carburetor with throttle position sensor (TPS) produces ultra-precise fuel/air mixing and lightning-quick throttle response.
• New “no tools” airbox adopts hinge-type quick-open lid. Battery rides 8mm lower than before for improved handling.
• Digital CDI ignition system delivers more precise spark and monitors engine speed to ensure optimal timing for fast, strong response during hard acceleration.
• New, bigger radiators with reinforcements ensure maximum cooling efficiency with greater strength.
• Wide-ratio five-speed transmission uses strengthened gears and YZ450F-spec multiplate clutch—good for quick-hitting power in the woods as well as eye-opening top-end power.
• Lightweight exhaust system maximizes engine power and allows hassle-free replacement of oil filter.
• Aluminum muffler with USFS-approved spark arrestor looks trick and keeps things light.
• Works-style clutch lever features oversize barrel adjuster for easy, on-the-fly adjustability of lever/cable play.
• Electric start ensures easy restarts.

Chassis/Suspension:

• All-new YZ-inspired aluminum frame helps reduce weight while optimizing mass centralization. An extensively tested assembly of aluminum forgings, castings and extrusions. The new WR frame retains legendary Yamaha handling and response.
• Removable aluminum rear subframe constructed of square-section tube for reduced weight.
• Fully adjustable air/oil-separate 48mm fork tubes deliver precise, fade-free handling; fork protectors provide excellent tube coverage.
• Tapered swingarm adopts YZ-style linkage for controlled, compliant rear suspension action.
• Revised axle and holders reduce weight in a critical area.
• The Kayaba shock provides 12.0 inches of travel with adjusters for high- and low-speed compression damping, rebound and spring preload—and features a larger piggyback reservoir for excellent damping and fade resistance.
• New, wave disc brake rotors front and rear reduce unsprung weight and provide excellent performance. Front and rear calipers with aluminum pistons deliver strong stopping power with progressive feel.
• Lightweight 21-inch front and 18-inch rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance.
• Premium Dunlops offer unbeatable, competition-spec traction and excellent wear.

Additional Features:

• Cool new YZ-derived bodywork, new engine covers and a thick new seat look great and feel excellent on long rides.
• New ProTaper aluminum handlebar and new forged triple clamp shaves weight and provides easier, lighter cornering.
• Slim design lightweight fuel tank holds 2.1 gallons.
• One-piece, high strength, plastic skid plate shaves weight and offers great protection.
• Lightweight headlight and sweet LED taillight maximize visibility and draw less current.
• Adjustable front brake lever.
• Wide footpegs are also lower for more comfort.
• Repackable aluminum muffler.
• Front wheel collar makes front wheel removal quick and easy.

U.S. MSRP: $7,199

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