Yamaha WR 250R

ENGINE
•Potent, liquid-cooled, 250cc, DOHC, 4-valve power plant with super light titanium intake valves & electronic fuel injection. This engine out performs its 250cc displacement and offers best in class performance.
• Electric starting & automatic decompression system.
•easy no hassle starting
•decompression system reduces battery power requirements… reducing weight
• Lightweight magnesium cylinder head cover reduces weight.
•Double overhead cam, 4-valve, compact combustion chamber.
•features a compact “pent-roof” combustion chamber design for optimum combustion
•maximum breathing efficiency for excellent power output
• Lightweight titanium intake valves & load-reduced oval valve springs.
•titanium valves reduces reciprocating weight & allows for a higher rpm limit (40% lighter than steel valves)
•reduced friction (load reduced) valve springs
•faster-revving & smoother power delivery
• “Ti” intake valves are 30mm in diameter, steel exhaust valves are 24.5mm
•Valve adjustment intervals are every 42,000 kms.
• High performance intake & exhaust camshafts
•provide outstanding class leading power
•cams feature a WPC (Wonder Process Craft) treatment that increases surface hardness for excellent durability & reduced sliding resistance
• Downdraft-type straight design intake port.
•most efficient intake flow for maximum engine performance
• Automatic, hydraulic cam chain tensioner.
•reduces maintenance & mechanical engine noise
•special cam chain “sliders” reduce internal frictional losses
• Lightweight roller bearing style crankshaft.
•optimized mass delivers excellent throttle response & strong acceleration
• Engine counter balancer
•reduces vibration for improved rider comfort & reduced rider fatigue
•despite being “only” a 250 this unit can cruise at highway speeds comfortably
•Direct ceramic composite plated cylinder uses “liner less” bores.
•ceramic coating sprayed directly on the aluminum block, eliminating the liner & reducing weight
•excellent heat dissipation for consistent power delivery
•coating enhances the thin film of oil between the cylinder & piston, reducing friction & increasing power
•Lightweight, short-skirt, forged aluminum piston.
•lightweight design means faster throttle response
•reduced mechanical vibration for excellent durability
•Piston oil cooler jet nozzle
•directs oil to the desired portion of the cylinder & underside of the piston
•reduces piston, cylinder & rod temperatures for excellent durability
• Cylinder “cutaways” allow air “trapped” under the piston to enter a side chamber (or cutaway).
•reduces horsepower-robbing “pumping losses”
•Crankcase also utilizes special “cutaways”

•reduces horsepower-robbing “pumping losses”
•crankcase cutaways match cylinder cutaways for maximum efficiency
•Wet sump lubrication system.
•reduces weight & complexity versus a dry sump system
•Easy access element-type oil filter & drain plug for fast oil changes.
•38 mm Mikuni throttle body fuel injection system.
•system uses throttle position sensor (TPS)
•12 hole injector with dual spray pattern for optimum fuel atomization
•fuel injection benefits include choke-free starting, steady idling during warm up, excellent fuel economy & reduced emissions
• Wide ratio 6-speed transmission with heavy duty clutch
•optimized gear ratios for both on & off road riding
•transmission adopts a “shower type” lubrication system for great reliability
•6th gear is an overdrive gear to reduce engine rpm at highway speeds
•clutch lever pull is light & easy
•Quick-access, lightweight aluminum outer clutch cover
•allows fast, easy access to the clutch
• Easy access, 4.1 liter air box with foam air filter
•special intake control valve provides state of the art intake & emission control
•foam air filter is a washable design to reduce tune-up costs
• Single, 9.5KW rad… located on right side, below steering head.
•electric cooling fan maintains consistent engine temperatures even in stop & go traffic or during technical off road riding
• Maintenance-free transistor controlled ignition (TCI).
•produces a strong spark for fast starts
•provides precise ignition timing / mapping for optimum engine performance at all rpms
•High performance direct ignition coil (ignition coil is built into the spark plug cap).
•reduces weight & complexity
• Lightweight, compact “rare-earth-type” ACM (alternating current magneto).
•reduced weight
•14V & 350W output
• Upswept exhaust system
•stainless steel header pipe & a compact 3-stage expansion type muffler
•honeycomb catalyzer reduces exhaust emissions
•system maximizes engine power & allows hassle-free replacement of the oil filter element
•cleanable screen-type spark arrestor
•heat shields protect rider & passenger
• Exhaust system also features Yamaha’s EXUP System (Exhaust Ultimate Power Valve).
•single butterfly valve prevents the “blow back” phenomenon caused by “valve overlap”
•EXUP system eliminates “flat spots” in the power band & reduces emissions too.
• Solenoid activated Air Induction System (AIS) reduces harmful exhaust emissions.
•Heavy duty plastic water pump & stator cover guards.

CHASSIS
• Lightweight, compact aluminum semi-double-cradle frame.
•main frame is cast aluminum, forged aluminum is used below the steering head area
• separate detachable down tubes are high tensile steel
•Yamaha has maintained the semi double cradle design to allow for “controlled flex” to optimize suspension performance
•Detachable steel rear sub frame.
•constructed of round steel pipe
•detachable design provides easy rear suspension access & reduces costs in the event of loop out
•Lightweight, tapered, aluminum swingarm.
•features a mix of extruded, cast & forged parts for an optimized rigidity-strength balance
•lightweight design reduces unsprung weight for optimum suspension performance
•excellent rear wheel control & traction
• 46mm, adjustable inverted, Kayaba cartridge fork with 270mm (10.6″) wheel travel.
•adjustments include: 19-way compression damping and 17-way rebound damping
•suspension performance can be tailored to suit riding conditions & riding preferences
• Cast aluminum upper triple clamp & forged aluminum lower triple clamp.
•reduces weight
•excellent & durability strength
•Rugged plastic wrap around fork protectors.
•protection against dirt, mud & stone chips
•self-supporting design reduces friction for smoother fork operation
• Fully adjustable, link, Monocross rear suspension with 270mm (10.6″) of wheel travel.
•piggy-back style shock improves cooling & reduces shock fading
•shock adjustments include: spring preload, 12 way compression damping & 23 way rebound damping
•link-type design provides a rising rate (progressive) suspension function for good compliance on small bumps, yet able to absorb the big bumps with reduced bottoming
•250mm floating front disc brake with “wave style” rotor & Nissin twin piston caliper.
•”wave” style rotor (disc) reduces weight, improves cooling (more surface area) & improves styling
•braking performance is excellent with great feel & control
•adjustable front brake lever
• 230mm rear disc utilizes a lightweight “wave style” rotor & Nissin single piston caliper.
•rugged, plastic rear caliper protector
•integrated Nissin rear master cylinder
•”wave” style rotor (disc) reduces weight, improves cooling (more surface area) & improves styling
•braking performance is excellent with great feel & control
•7.6 liter steel fuel tank
•in tank electric fuel pump
•”reserve” portion of the tank is 2.1 litres (low fuel light illuminates)
•Rugged, aluminum DID rims.
•21 x 1.60 front & 18 x 2.15 rear rim sizes
•excellent durability
•reduces unsprung weight for optimal suspension performance
•straight pull spokes
•Competition WR series inspired lightweight, digital meter assembly.
•2 modes available
•basic mode features: speedometer, odometer, dual trip meters, & clock plus FI system diagnostics
•pace management mode features: stopwatch & distance-compensating trip meter
• Slim design 60/55 watt halogen headlight.
•Compact LED taillight

DETAILS
•Premium dual sport tires
•Passenger footpegs
•Serrated steel foot pegs, steel shifter with folding tip & aluminum rear brake lever
•Heavy duty “O” ring chain
•Lightweight chain guide helps reduce chance of chain derailment & helps protect rear sprocket
•Locking helmet holder
•Locking fuel cap & steering
•Oil level sight glass
•Low-maintenance sealed battery (battery should be charged during winter storage)