A world championship winner, the proven Yamaha WR250F options enduro specific transmission and suspension settings. to not mention the gadgets required to "go the gap."
If there is one factor enduro racers will expect, it is the sudden.
That's why our engineers did not compromise something in style of the new WR250F. Its agility is second to none in tight wooded sections, whereas its YZ bred, 249cc, 5-valve engine produces arduous, quick power for wide open areas. Push button begin saves you energy and a digital enduro race laptop with speedometer, clock and trip meter, helps set your pace.
Tight trails to open desert.
The Yamaha WR250F options a strong and reliable engine, a YZ-bred advanced aluminum frame, push button begin, and digital enduro laptop with speedometer, clock and tripmeter. The 2012 WR250F is additionally inexperienced sticker approved to be used in California.
Yamaha WR250F Highlights and Key Features:
YZ Bred 249cc Engine
Pro Taper Handlebars
Push Button begin
Key Features:
•YZ-bred advanced aluminum frame is rigorously designed from castings, forgings and extrusions—enhances handling whereas retaining legendary Yamaha feel and characteristics.
•Highly evolved high-revving five-titanium-valved engine starts with the push of a button.
•Cool digital enduro laptop offers speedometer, clock, tripmeter, etc., in basic mode—or pace management functions like timer, distance-compensating tripmeter, average speed, etc., when switched to race mode.
•The WR250F is inexperienced sticker approved for California.
Yamaha WR250F options and advantages
ENGINE
Liquid-cooled, 249cc, 5-valve, DOHC, 4-stroke powerplant with super lightweight titanium valves relies on the YZ250F engine style. The WR250F engine options completely different camshafts, european and exhaust system than the YZ250F for improved low to mid vary power that is best fitted to enduro kind riding.
Super convenient electrical beginning suggests that quick, certain starts. the electrical starter is additionally saved by a manual kick starter.
Hassle free automatic decompression system ensures quick restarts in any gear.
Convenient, handlebar-mounted hot begin lever for simple restarts when the engine is hot.
Magnesium cylinder head cowl helps cut back weight.
Optimized combustion chamber style provides the foremost economical intake and exhaust flow for max engine performance
Titanium valves and load-reduced springs decrease weight by over four-hundredth over a traditional valve train and cut back reciprocating mass for faster-revving, smoother-hitting power delivery across the rev vary.
Special cylinder style options cutaways that enable the air "trapped" underneath the piston to enter a facet chamber (or cutaway) to scale back horsepower-robbing "pumping losses."
The crankcase conjointly utilizes cutaways to scale back "pumping losses." The crankcase cutaways match the cutaways within the cylinder.
Dry sump oil tank is found in front of the engine between the frame tubes for cover. This style centralizes mass and reduces the centre of gravity for improved handing and a lighter feel.
The crankcase options a "tri-axis" style for the crankshaft, main and drives axles. This tri-axis style keeps the crankcases a lot of compact whereas conjointly centralizing mass for higher handling. All of the shafts are positioned low within the cases to take care of a coffee centre of gravity for nice handling and maneuverability.
Special "enduro focused" camshafts (intake & exhaust) give outstanding low to mid vary power well matched for off road use.
Balancer shaft reduces vibration for nice rider comfort and reduced rider fatigue.
Lightweight crankshaft provides quick throttle response.
Lightweight, short-skirt, solid piston provides nice sturdiness and its light-weight style suggests that faster engine response.
Oil volume in engine has been optimized to scale back weight and oil "drag" connected power losses.
Compact automatic cam chain tensioner reduces maintenance and mechanical engine noise.
37mm, Keihin FCR, flat-slide carburetor with TPS (throttle position sensor) provides wonderful throttle response.
ECU options 3D ignition mapping and provides optimal timing in any respect rpms for quick engine response.
Lightweight direct ignition coil is integrated into the spark plug cap to scale back weight and complexity
Wide ratio 5-speed transmission options gear ratios designed for enduro kind riding which match the engine's power characteristics.
Heavy-duty clutch offers {a light|a light-weight|a light-weight}, progressive clutch feel with less lever effort for smoother shifting.
Quick-access, light-weight aluminum outer clutch cowl permits quick, easy accessibility to the clutch.
YZ primarily based compact twin radiators give optimum cooling and have a re-enforcing bar to assist defend the rads within the event of a tip over.
Washable, dual-stage, foam air filter will be accessed while not tools via "Dzus-type" fasteners. The air box is secured to the frame via only 1 bolt for quick removal.
Lightweight exhaust system options a chrome steel header pipe with titanium heat defend, aluminum muffler and titanium rear cone. this method maximizes engine power and permits hassle-free replacement of the oil filter.
Lightweight aluminum wrapped muffler offers an eighty two dba noise level (stock settings). This muffler options a "serviceable", screen-type spark arrestor that prevents sparks from exiting the exhaust.
Oversize race kind "barrel adjuster" for simple, on-the-fly adjustability of clutch lever freeplay.
AIS (air induction system), located on front facet of cylinder head reduces harmful emissions.
CHASSIS / SUSPENSION
Lightweight, compact aluminum semi-double-cradle frame options a forged steering head whereas the rest of the frame uses solid, pipe stock and extruded parts. Yamaha has maintained the semi double cradle style to permit for "controlled flex" to optimize suspension action. This frame style provides a coffee centre of gravity for a lightweight feel and razor sharp handling, and less rider fatigue, and wonderful stability.
Removable, aluminum rear sub frame made of square-section tube reduces weight and provides simple rear suspension access.
Lightweight, tapered, aluminum swingarm is made using "hydro forming"; a special forming methodology that uses high pressure water to make shapes.
48mm, adjustable inverted Kayaba cartridge fork give wonderful suspension performance. Front wheel travel is 300mm (11.8").
Front fork changes include: 20-way compression damping and 20-way rebound damping. Optional fork springs are obtainable through real Yamaha components.
Large plastic fork protectors wrap round the fork tubes for increased protection against dirt, mud and stone chips. These fork protectors are self-supporting to scale back friction for smoother fork operation.
Forged aluminum higher and lower triples clamp cut back weight.
Adjustable solid handlebar mounts enable the handlebars to be moved 10mm rearward if desired.
High tech, lightweight, ProTaper aluminum handlebar with reinforcing crossbar and protecting foam pad.
Monocross rear suspension system options a totally adjustable, Kayaba "piggy back" vogue shock with separate adjusters for high- and low-speed compression damping.
Shock changes include: spring preload, twenty clicks of low-speed compression damping, a pair of turns of high-speed compression damping and twenty clicks of rebound damping. Rear wheel travel is 310mm (12.2").
Link-type rear suspension provides a rising rate (progressive) suspension operate.
250mm absolutely floating front disc brake with "wave style" rotor is squeezed by a twin piston Nissin caliper fitted with light-weight, aluminum pistons providing wonderful braking performance.
"Shorty style" adjustable front brake lever.
245mm rear disc utilizes a light-weight "wave style" rotor. The Nissin single piston caliper and an integrated rear master cylinder (fluid reservoir is integrated into the highest of the master cylinder to scale back weight) delivers sturdy, progressive stopping power with wonderful management and feel.
Rugged, Excel 21" front and 18" rear rims give exceptional sturdiness and facilitate cut back unsprung weight for optimal suspension performance.
High tech, light-weight digital meter assembly. This compact meter features: speedometer, twin tripmeters, odometer and a clock within the basic mode. Or within the "race mode", pace management functions like timer, and distance compensating tripmeter.
Rugged "slim-line" bodywork permits quick, simple rider movements and a lighter overall machine feel.
Revised seat relies on YZ-F vogue however is wider and options new improved rider comfort throughout an extended ride. "Gripper" or "pebble" seat cowl.
Stylish slim style front headlight is compact and offers thirty five watts of lighting power. The headlight beam is adjustable up and down.
Slim style compact LED taillight is tucked out of the thanks to forestall harm
8 liter black plastic fuel tank is intended to permit simple rider movements. The tank options a special "fluorination surface treatment" that reduces fuel permeation for improved environmental protection.
Lightweight aluminum kickstand is intended to permit a lot of ground clearance.
Heavy duty one piece resin plastic engine guard. solely three bolts hold it in place for simple removal when laundry the bike.
Extra wide 55mm chrome steel foot pegs give wonderful grip.
ADDITIONAL DETAILS / options
8-litre fuel tank with convenient on/off/reserve petcock for peace of mind
Serrated rear brake lever and folding shift lever tip
Rugged, plastic, lower rear disc and rear caliper protectors
Sealed, low-maintenance vi amp hour battery is gel-filled kind to stop leaks within the event of a tip-over.
Waterproof starter button and engine kill switch are handlebar-mounted.
Lightweight chain guide (support) helps cut back likelihood of chain derailment. conjointly helps defend rear sprocket harm too.
Heavy duty "O" ring chain for sturdiness
E10 friendly fuel system parts
Review
The huge changes to Yamaha's '05 YZs may lead you to believe the motocross effort soaked up all the R&D, however it's like there was lots left for the off-road bikes moreover. Yamaha's newly released WRs feature a slew of changes, each major and minor, aimed toward making lighter, a lot of agile and a lot of user-friendly machines. we have a tendency to got our grubby paws on the newly released WR 250 and 450 at California's Hungry Valley and immediately headed out for a few bushwhacking.
The biggest changes Yamaha emphasised were a lowered center of gravity and lowered seat height for each the 250 and 450. WRs have a history of being tall and top-heavy, however the '05s are a marked improvementit sounds like the chronic drawback has been solved. The WRs currently carry their (lighter) weight abundant lower. Yamaha raised the steering head tube, however the fork is that the same length, that the engine and a lot of importantly the crankshaft are carried lower. and the shock is 3mm shorter, that balances out the bike and makes it lower overall compared to 2004. Overall, the seat height was decreased by 10mm on the 250, and 20mm on the 450. YZ shrouds and radiators complete the package by slimming down each bikes. each models were rather more willing to vary directions in tight conditions. it absolutely was abundant easier to induce leaned over in corners and maneuver through thick, tight brush.
2005 Yamaha WR450 options... browse full caption
2005 Yamaha WR450 options a lot of refined power, giving it easier roll-on.We did not truly take a look at the bikes in showroom stock condition. we have a tendency to replaced the WR throttle stopsthat limit the throttle gap to concerning halfwaywith YZ units that enable full throttle travel. we have a tendency to conjointly removed the new-for-2005 small finish baffle and unplugged the gray wire underneath the tank, since that was the method we have a tendency to rode our 2004 bikes, and it absolutely was the foremost equal comparison. The WR250F received a rise in power whereas the main focus on the 450 was to refine its huge power for easier roll-on. The 250 has a lot of bark and good bottom-end grunt, however best showcases its new power on the highest endit screams. The 450's bark was partially calmed by reducing the compression ratio. It still has huge power, however currently comes in a very a lot of manageable package. The lower center of gravity as well as the smoother low-to-mid delivery created huge enhancements within the 450s agility.
The WRs received new 48mm forks, though not identical KYB fork because the different '05 blue bikes. The beefy new front suspension is far a lot of rigid than the plush feel of the '04s. With the stock settings, the front finish was too stiffpushing in sand washes and dancing around on rocks or bumpy hard-pack. we have a tendency to softened up the compression between 2 and 6 clicks betting on the dimensions and speed of the rider. we have a tendency to conjointly went out 2 clicks on the fork rebound. The action of the fork and also the steering precision of the bike is incredibly closely tied to the sag. you'll be wanting to use caution to line it between a hundred and a hundred and five millimeters. The shock soaked up chop fairly well, and pounded through whoops higher than ever.
The WR450 is currently inexperienced sticker... browse full caption
The WR450 is currently inexperienced sticker legal; anticipate identical for the 250 in '06.Yamaha conjointly addressed EPA an CARB laws in their re-design. The new USFS-approved aluminum exhaust with spark arrestor is Federal noise level legal at 82dba. With the baffle out, it still registers underneath 96dba, meeting California laws. The 450's newly designed air induction system conjointly makes it green-sticker prepared (a much-welcomed amendment for Californians bored with being finish off the moment rangers catch a glimpse of blue plastic). Expect the 250 to be inexperienced sticker-able in '06.
Look for the complete take a look at on each Yamaha WR's within the February issue of Dirt Rider Magazine.
