The afternoon of the same day is spent aboard the Rís fraternal twin, the WR250X. Conceived and born from the same tuning fork parents, and sharing much of the same component DNA, it is apparent by sundown that the contrasts between the R and X go beyond the two modelsí differing cosmetic treatments.
Because of their historically inherent buzz and underpoweredness, Iíve never considered a small-displacement Thumper as the engine configuration on which to tackle the Alaska Highway. But hereís where the WR250R begins to shine. Riding from the Inn Iím impressed with the minimal vibration coming from the hard working little piston pushing the 500 lbs. of combined of bike and rider weight down the freeway. In fact, the bike is so smooth I donít realize Iím riding in 5th gear. Grabbing the transmissionís top cog reduces the revs to a few less per minute and it becomes apparent that riding this motorcycle for longer distances will not induce the numbing discomfort usually associated with Thumpers.
Nor am I worried about insufficient power, another innate shortcoming associated with sub-400cc machines. Horsepower figures were unavailable, but the WR has a lot more acceleration than the 250cc scooter that wheezed up hills under the additional weight of a physics book when shuttling you to class during your college career.
Citing that the demographic doesnít desire a tightly wound motor with cramped service intervals, but rather an effective engine requiring minimal maintenance, Yamaha endowed both models with a purpose-built powerplant to meet the latter criteria, while also gracing them with modern technology such as titanium intake valves, a ceramic composite plated cylinder, high lift cams, a newly designed 4-valve cylinder head and a short skirt aluminum piston. The engine also has an oil jet located beneath the piston to minimize piston temperatures.
The Mikuni fuel-injection system utilizes a 38mm throttle body and a 12-hole injector for efficient combustion. The WR250R/X also features a radiator with a fan said to exhaust dissipated heat away from the rider (a good thing on hot days, but a not so good thing on cold ones).
As our group turns off the pavement and onto au natural terra firma another strength of the X model is revealed ó suspension. The 46mm inverted cartridge KYB fork has 10.6 inches of travel and is adjustable for compression and rebound. The Soqi rear shock also has 10.6 inches of travel, is fully adjustable and features nearly 1 inch of ride height adjustability. (To reduce or raise the ride height, a lock nut must be loosened to release the bottom shock mount.)
Pounding across the undulating desert floor the suspension seems perfectly attuned to the type of off-road riding for which the bike was made. More accomplished off-road journalists are carrying greater speeds than I, and when we stop and converse about the bike everyone seems impressed with the performance of the suspension, making the WR250R a competent tool for a wide variety of riders with varying degrees of skill.
By noonish our group rolls up to Grange Motor Circuit for lunch and a change of attire before swapping the R model for its Supermoto counterpart and etching U-shaped hieroglyphics around the corners of the popular kart track.
Cosmetically the WR250X is recognizable by the blacked-out treatment to the frame, swingarm and forks. Smaller wheels (17s on the X model vs. 21 inch front and 18 inch rear on the R), radial BT090 Bridgestone tires (the R models uses DOT approved TW301 and 302 dual-purpose rubber) and a larger front brake rotor (298mm x 4.0mm vs. 250mm x 3.5mm) augment the intended Supermoto purpose of the X model.
To match the larger front brake disc, Yamaha included a larger master cylinder piston (12.7mm vs. 11mm) to the X model. Brakes on both the X and R models were equally impressive.
Both Nicky Hayden and Max Biaggi have been photographed doing hot laps around the Grange Circuit. Itís a fun, 14-turn, 0.8-mile track that instigates competition among journalists aboard equally matched Supermoto machines. And once the Bridgestone tires were up to temperature, the unintimidating nature of the 250X allowed for some close competition Ö err, evaluating.
Wearing the same suspension components as the WR250R, the Xís units are, according to Yamaha, ďoptimized for street and Supermoto riding.Ē While stock settings may be comfortable for street use, on-track performance will definitely improve with a little stiffening of the adjustable fork and shock. The Xís rear Soqi shock also features the 0.9 inch of ride height adjustment of the R model.
Weighing an inconsequential 4 dry pounds heavier than the R model (280 vs. 276 lbs.), the WR250X is great fun for recreational Supermoto track time, especially on a small circuit like Grange where the longest straight measures only 950 feet. Twisting the throttle hard coming out of corners keeps things exciting without the fear of inadvertently breaking traction as the bigger 450s are wont to do.
Being street-legal machines the X and R must pass emissions standards, so the exhaust system on both models comes equipped with a honeycomb catalytic converter and Yamahaís iconic EXUP system. Of course these items add weight and complexity to a muffler, so the word petite doesnít apply, but the aftermarket should take care of that, and Yamaha says the bikeís ECU should compensate for a non-EXUP pipe. If not, a DynoJet Power Commander should do the trick.
For anyone interested in purchasing a WR250X and performing a garage conversion into a WR250R, a la KTM, Yamaha says the wheels and front brake caliper are all thatís necessary and are available from your local dealer. To compensate for the smaller 17-inch rear wheel, the X modelís sprocket is smaller, so you should also consider the R modelís rear sprocket, which may also require a longer chain. But if your idea of off-roading is the occasional fire road or an overnighter at a KOA campground, the X model and its sticky Bridgestone Supermoto rubber will suffice.
Iíd be inclined to go with the X model. As a commuter, trackday toy or weekend road warrior and for the dirt road cameo appearance the WR250X is the bike I think can do it all. But for the guy whose commute is riding the back 40 to mend a fence, check on the herd and occasionally go into town to pick up a Saturday afternoon six pack, the R model will be a better choice.
Whichever bike suits your purpose, Yamahaís WR250R/X has filled a void in the marketplace somewhere between high tech, basic performance and small capacity. The new WRs arenít fire breathing technofiles, nor are they parts-bin Frankenbikes, but for the sub-$6,000 price ($5,899 for the 250R and $5,999 for the X) and the target audience Big Blue has in mind, the R or X are attractive machines.
And as Iím watching television, typing feverishly during commercial breaks, Chad Reed laps the field up to ninth place, scoring the victory and his sixth win of the 2008 Supercross season. I realize that this should be a very good year for Yamaha Ė either off road or on.
|(click here for complete Specs page)||(click here for complete Specs page)|
|Engine Configuration||Single cylinder, 4 stroke, DOHC||Single cylinder, 4 stroke, DOHC|
|Engine Cooling System||Liquid cooled||Liquid cooled|
|Valves Per Cylinder||4||4|
|Bore x Stroke||77 x 53.6mm||77 x 53.6mm|
|Valve Angle (Included)||Intake 11.5° / Exhaust 13.0°||Intake 11.5° / Exhaust 13.0°|
|Valve Train Type||Bucket/shim, cam chain drive||Bucket/shim, cam chain drive|
|Valve Adjustment Interval||every 26,600 miles||every 26,600 miles|
|Intake Valve Diameter||30.0mm (Titanium)||30.0mm (Titanium)|
|Exhaust Valve Diameter||24.5mm (Steel)||24.5mm (Steel)|
|Intake Valve Stem Diameter||4.5mm||4.5mm|
|Exhaust Valve Stem Diameter||4.5mm||4.5mm|
|Intake Valve Maximum Lift||8.6mm||8.6mm|
|Exhaust Valve Maximum Lift||8.9mm||8.9mm|
|Intake Valve Timing (0.15 mm lift) Open BBDC||64°||64°|
|Camshaft Event Angle Intake / Exhaust||105° / 110°||105° / 110°|
|Fuel Delivery System||EFI/ Mikuni/ 12 Hole Injector||EFI/ Mikuni/ 12 Hole Injector|
|Throttle Body Venturi Size||38mm||38mm|
|Air Filter Type||Oiled Foam / Washable||Oiled Foam / Washable|
|Exhaust System Type||Steel w/ EXUP||Steel w/ EXUP|
|Ignition System||DC - CDI (digital)||DC - CDI (digital)|
|Lubrication System||Wet Sump||Wet Sump|
|Oil Capacity||1.5 L (1.6 US qt)||1.5 L (1.6 US qt)|
|Fuel Capacity||7.6 L (2.0 US gal)||7.6 L (2.0 US gal)|
|Fuel Reserve Amount||2.1 L (0.55 gal)||2.1 L (0.55 gal)|
|Recommended Fuel||Premium Unleaded 91 octane (R+M)/2||Premium Unleaded 91 octane (R+M)/2|
|Transmission Type||Constant mesh 6-speed||Constant mesh 6-speed|
|Clutch Type||Wet Multi-plate||Wet Multi-plate|
|Clutch Actuation System||Cable / pinion gear||Cable / pinion gear|
|Clutch Spring Type||Coil||Coil|
|Number of Clutch Springs||5||5|
|Number of Clutch Plates||13||13|
|Primary Drive||Gear (straight cut)||Gear (straight cut)|
|Primary Drive Gear Teeth (Ratio)||78/25 (3.120)||78/25 (3.120)|
|Final Drive Sprocket Teeth (Ratio)||43/13 (3.307)||42/13 (3.230)|
|Transmission Gear Teeth (Ratios) 6th||22/28 (0.786)||22/28 (0.786)|
|5th||24/27 (0.888)||24/27 (0.888)|
|4th||26/25 (1.040)||26/25 (1.040)|
|3rd||29/22 (1.318)||29/22 (1.318)|
|2nd||29/16 (1.813)||29/16 (1.813)|
|1st||37/14 (2.642)||37/14 (2.642)|
|Transmission Overall Ratios 6th||8.109||7.921|
|Frame Design||Aluminum/ Semi Double Cradle/ Detachable Sub-Frame||Aluminum/ Semi Double Cradle/ Detachable Sub-Frame|
|Rake / Trail||26.67°/ 111.0mm (4.37 in)||25.33°/ 76.0mm (2.99 in)|
|Wheelbase||1420 mm (55.9 in)||1425 mm (56.1 in)|
|Front Forks Maker / Type||"KYB" / Inverted Cartridge||"KYB" / Inverted Cartridge|
|Fork Inner Tube Diameter||46.0mm||46.0mm|
|Rebound Damping||range 24 clicks (10 out std.)||range 24 clicks (10 out std.)|
|Compression Damping||range 20 clicks (10 out std.)||range 20 clicks (10 out std.)|
|Spring Rate||4.6 N/mm||4.6 N/mm|
|Front Wheel Travel||270 mm (10.6 in)||270 mm (10.6 in)|
|Rear Wheel Travel||270 mm (10.6 in)||270 mm (10.6 in)|
|Rear Suspension Maker / Type||"SOQI" / Piggy-back||"SOQI" / Piggy-back|
|Rebound Damping||range 25 clicks (12 out std.)||range 25 clicks (13 out std.)|
|Compression Damping||range 12 clicks (10 out std.)||range 12 clicks (7 out std.)|
|Spring Pre-load||Variable thread adjust nut (YZ style)||Variable thread adjust nut (YZ style)|
|Spring Rate||80 N/mm||80 N/mm|
|Front Brake||"Nissin" 2-piston caliper / 250 x 3.5mm "Wave" type Disc w/ "Nissin" master cylinder||"Nissin" 2-piston caliper / 250 x 3.5mm "Wave" type Disc w/ "Nissin" master cylinder|
|Rear Brake||"Nissin" 1-piston caliper / 230 x 4.5mm "Wave" type disc w/ "Nissin" YZ style master cylinder||"Nissin" 1-piston caliper / 230 x 4.5mm "Wave" type disc w/ "Nissin" YZ style master cylinder|
|Front Wheel||1.60 x 21 spoke / Aluminum rim||17M/C x MT3.00 spoke / Aluminum rim|
|Rear Wheel||2.15 x 18 spoke / Aluminum rim||17M/C x MT4.00 spoke / Aluminum rim|
|Front Tire||Bridgestone / TW-301F / 80/100-21M/C 51P (dual purpose)||Bridgestone / BT090F Radial G / 110/70R17M/C 54H|
|Rear Tire||Bridgestone / TW-302F / 120/80-18M/C 62P (dual purpose)||Bridgestone / BT090R Radial G / 140/70R17M/C 66H|
|Overall Length||2175mm (85.6 in)||2110mm (83.1 in)|
|Overall Width||810mm (31.9 in) @ handlebar ends||810mm (31.9 in) @ handlebar ends|
|Overall Height||1230mm (48.4 in)||1190mm (46.9 in)|
|Seat Height Lowest / Highest||908mm (35.7) / 930mm (36.6 in)||873mm (34.3) / 895mm (35.2 in)|
|Ground Clearance||300mm (11.8 in)||265mm (10.4 in)|
|Battery / Voltage, Capacity||YTZ7S (sealed) / 12V. 6.0Ah||YTZ7S (sealed) / 12V. 6.0Ah|
|Alternator Output||14V / 350W @ 5,000 rpm||14V / 350W @ 5,000 rpm|