2007 Yamaha YZ250F
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– 2007 Yamaha YZ250F
2007 Yamaha YZ250F
Choosing the YZ250F is the easy part.
Ongoing refinement to chassis and engine produce an amazingly balanced, light-handling machine with performance that’s accessible to all levels of riders. Lighter, improved handling, more revs, more YZ.
Ready to win … right out of the crate
For 2007, we have made a number of detail improvements such as an overall lighter front end, revised rear ride height for improved cornering and new frame with optimized rigidity balance for light, precise handling. The engineers also focused attention on improving the low to mid engine performance with revisions to the intake, exhaust and ignition systems. Loaded with the most sought after “race ready goodies” in the business like Pro Taper Handlebars, wide “ti” footpegs, Excel rims, etc. the YZ250F is ready to roll up to the starting gate right out of the crate.
– Revised liquid-cooled, 249cc, DOHC, 5-titanium valve, 4-stroke engine features a 13,500-rpm redline for incomparable, competition-crushing power.
– Automatic decompression system means easy starting. The YZ250F restarts in any gear.
– Optimized combustion chamber design provides the most efficient intake flow for maximum power.
– Titanium valves and load-reduced springs decrease weight by more than 40% over a conventional valve train and reduce reciprocating mass for faster-revving, smoother-hitting power delivery across the rev range.
– The cylinder features a ceramic composite coating which insures faster uniform heat dissipation, reduced friction and a longer service life.
– The inclination of the cylinder has been reduced for improved mass centralization which in turn provides a lighter handling feel.
– Lightweight convexed crowned forged piston matches the intake port design for fast response and great durability.
– Special cylinder design features cutaways that allow the air trapped under the piston to enter a side chamber (or cutaway) to reduce horsepower-robbing “pumping losses.”
– Lightweight crankcase also utilizes cutaways to reduce “pumping losses.” The crankcase cutaways match the cutaways in the cylinder.
– Magnesium cylinder head cover helps reduce weight.
– Revised dry sump lubrication system uses a newly designed oil tank positioned just in front of the engine. The tank features a new partition in the centre of the tank that improves the air-oil separation function. This tank is positioned low in the chassis which centralizes mass and lowers the centre of gravity for exceptional handling and a light feeling.
– Oil volume has been optimized for 2007.
– Lightweight, oil delivery hoses reduce weight.
– Slick-shifting, 5-speed transmission with heavy-duty, multi-plate clutch features involute splines on the transmission axles, ensuring smoother shifting and instant hook-up under power.
– New lightweight magnesium, quick-access outer clutch cover for fast, easy clutch maintenance.
– New intake manifold bolts to the head for improved serviceability and function.
– Revised Keihin FCR-MX37 flat-slide carburetor with throttle position sensor (TPS) ensures ultra-precise fuel/air mixing and lightning-quick throttle response. The 2007 carb features a revised air vent passage and new settings for improved engine power.
– Convenient, handlebar-mounted hot start lever ensures fast starts when the engine is hot.
– Specially designed kick start lever, ratchet and internal mechanism helps to facilitate easy starting and improves kick starter durability.
– Washable, dual-stage, foam air filter provides excellent filtering qualities.
– Revised CD ignition system delivers a precise spark and monitors engine speed to ensure optimal timing for faster, stronger response at all rpms. The CD settings have been improved for 2007 to match the engine improvements.
– Ignition coil is integrated into spark plug cap to reduce weight and complexity.
– Revised compact, lightweight, single core, dual radiators provide outstanding cooling efficiency. A new reinforcing bar has been added to the rads for improved protection in the event of a tip over. The louvers that direct the air into the rads has been revised for improved air flow into the rads.
– Rad hose layout has been revised for reduced weight and serviceability.
– Lightweight exhaust system utilizes a 4-stage expansion format that improves the cylinder filling induced by the exhaust pulse effect, resulting in new power characteristics.
– Lightweight titanium header pipe and heat shield reduces weight. Specially shaped header pipe angle maximizes engine power and allows hassle-free replacement of the oil filter.
– The exhaust pipe between the header and muffler has been redesigned. It is now 50.8mm in diameter to improve engine power.
– Revised lightweight aluminum / stainless steel muffler features a new diffuser end cap / cone that helps to reduce noise while maintaining power. This muffler is designed to meet the new 2007 AMA noise regulation.
– Trick, works-style clutch lever features a race-spec “barrel adjuster” for on-the-fly adjustability.
– Revised compact aluminum semi-double-cradle frame features a cast steering head while the remainder of the frame uses forged, pipe stock and extruded components. Yamaha has maintained the semi double cradle design to allow for “controlled flex” to optimize suspension action. This frame design provides a lower centre of gravity for a light feel and razor sharp handling, plus less rider fatigue, and excellent stability.
– The steering head has been moved 3mm closer to the rider to improve cornering feel and lighter handling. The engine mounting bolts and the mounting plates have been revised to optimize the rigidity balance of the entire chassis.
– Revised, removable rear subframe is constructed of square-section, lightweight aluminum pipe and is now 15 grams lighter than last year with the addition of weight reducing holes. Detachable design allows easy access when servicing rear suspension components. The bolts that secure the subframe are now 10mm for easier servicing (same size as the side covers).
– Revised lightweight, tapered, aluminum swingarm is produced using “hydro forming”, a special forming method that uses high pressure water to form shapes. The revised swingarm features a change to the chain adjuster area of the arm to reduce weight. The swingarm improves overall chassis balance for a lighter handling feel.
– New, forged aluminum upper triple clamp reduces weight by 17% over last year’s cast version. The reinforcing ribs have also been modified for improved strength and reduced weight. The handlebar holder has also been revised for reduced weight.
– New forged aluminum lower triple clamp reduces weight and features a change to the reinforcing ribs. The pinch bolts have also been shortened to reduce weight.
– New, lighter, forged aluminum adjustable handlebar mounts allow the handlebars to be moved 10mm rearward if desired.
– New Pro Taper handlebars are 8mm taller and feature a new “bend” for a roomier riding position. The Pro Taper design provides excellent strength and durability. Foam handlebar pad is included.
– Revised, 48mm, adjustable, inverted, Kayaba cartridge forks feature a twin-chamber design. The twin chamber design means the damper unit is in a separate structure which prevents aerated fork oil from entering the inner damper assembly and degrading its damping abilities. Since the inner damper is pressurized, it also eliminates bubbles forming in the oil.
– The balance between the inner and outer tubes has been optimized, while the Kashima coating on the pressure tank and the piston rod reduce friction for smoother suspension performance. The cylinder diameter is 24mm for excellent primary cushioning and a low friction oil seal is used to reduce stiction.
– The 48mm inverted KYB fork also features a Transfer Control Valve (TCV). The TCV enhances the damping force of the inner damper from mid stroke to full stroke and improves bottoming characteristics. The benefit of TCV is more precise control throughout the full stroke range. The TCV is located on the upside of the spring and its function is controlled by piston speed, not piston position … hence the term “Speed Sensitive fork”.
– “Kashima coating” has been applied to the fork tubes to reduce friction for smoother suspension performance. Front wheel travel is 300mm (11.8″).
– Front fork adjustments include: 20-way compression damping and 20-way rebound damping. Optional fork springs are available through Genuine Yamaha parts.
– A new design front axle bracket reduces weight.
– Large, semi-wrap-around plastic fork protectors provide excellent protection from stone / rock chips. The “self-supporting” design helps to reduce friction for smoother fork operation.
– Revised Monocross link rear suspension system features a fully adjustable, Kayaba, piggyback shock which provides 307mm (12.1″) of wheel travel and features separate adjusters for high- and low-speed compression damping. Adjustments include: spring preload, 20-way rebound damping, 20-way low-speed compression damping and 2 turns of high speed compression damping.
– The shock body is 1.5mm longer than last year to optimize the ride height for more precise cornering. Selected shock body components such as the compression and damping adjuster mechanisms and spring guide have been changed from steel to aluminum to reduce weight. The piston rod diameter is 18mm while Kashima coating is used in the shock body and sub tank to reduce friction and improve suspension performance during a long moto. The rear suspension settings have been revised for 2007.
– Lightweight and trick “Beta” titanium shock spring reduces “unsprung weight” which has a dramatic effect on suspension performance. This titanium spring provides outstanding strength, and durability, combined with reduced weight.
– The linkage relay arms have been revised for 2007 to reduce weight. They are the same as those found on the YZ125/250 2-stroke models.
– The 2007 Kayaba shock utilizes a full rebound oil lock system for excellent suspension function and great ride quality.
– New 250mm floating front disc brake system utilizes a new lightweight “wave-type rotor” to reduce weight.
– New twin piston front brake caliper utilizes smaller aluminum pistons to reduce weight. The size of the caliper body has also been reduced for weight savings. This revised design provides excellent stopping power and feel. Shorty style, adjustable front brake lever too.
– Revised, lighter front brake hose is utilized.
– Revised master cylinder uses a smaller size piston for reduced weight.
– New 245mm rear disc brake features a new lighter “wave-type” rotor. This new rotor is squeezed by a single piston caliper which features an integrated master cylinder (fluid reservoir is integrated into the top of the master cylinder) for strong stopping power with excellent feel and control.
– The rear caliper and the lower portion of the wave rotor are protected by heavy duty plastic protectors.
– “Slim line” body components include: front and rear fenders, rad shrouds, side covers /number plates, gas tank and seat. This body design not only provides an aggressive appearance to the YZ250F but also allows for fast, easy rider movements.
– 7 liter fuel tank uses new lighter aluminum nuts to secure the rad shrouds.
– All new chain guide / support reduces weight for a lighter feel. Newly designed rubber swingarm protector
– Specially designed “Sun Star” rear sprocket increases the contact area between the sprocket and chain rollers, thereby reducing the load on the chain and increasing the service life of both chain and sprocket.
– Revised lightweight, 21″ front and 19″ rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance and handling. A minor shape change reduces weight
– Lightweight, 21″ front and 19″ rear Excel rims are exceptionally durable and reduce unsprung weight.
– Revised rear axle not only reduces weight but also makes chain adjustments easier.
– Dunlop knobby tires offer competition-spec traction and excellent wear.
– All new engine protector plate is more compact to reduce weight while still maintaining good protection.
– Revised “flat-design” seat features a dual foam design that provides good initial softness / comfort and then increases the firmness as more pressure is applied. For 2007 a new base layer of lightweight polypropylene foam is used. The “pebble” or “gripper” finish on the top and side surfaces provides excellent rider grip and durability.
– Large fuel cap and filler hole ensures easy opening and fast, hassle-free refueling.
– Lightweight, titanium footpegs provide excellent grip and ground clearance.
– Cleated, rear brake lever and folding shift lever tip offer superb grip and exceptional durability.
– Stainless steel, inner clutch cable provides excellent strength and long life.
– Rugged engine and water pump protector plates
Engine 4-stroke, liquid-cooled, DOHC, 5-valvew/titanium valves, single
Displacement 249 cc
Bore and Stroke 77 x 53.6 mm
Compression Ratio 12.5:1
Maximum Torque 2.9kg-m (21 ft-lb) @ 8,500 rpm
Fuel Delivery Keihin FCR MX37, flat-slide w/throttle position sensor
Transmission Constant mesh, 5-speed
Final Drive Chain
Suspension (Front) Fully adjustable 48 mm inverted fork
Suspension (Rear) Fully adjustable link Monocross
Brakes (Front) 250 mm floating disc
Brakes (Rear) 245 mm disc
Tires (Front) 80/100-21
Tires (Rear) 100/90-19
Length 2,160 mm (85″)
Width 825 mm (32.5″)
Height 1,299 mm (51.1″)
Wheelbase 1,469 mm (57.8″)
Seat Height 984 mm (38.7″)
Dry Weight 92.7 kg (203.9 lb)
Fuel Capacity 7 litres (1.6 imp. gallons)
Colour(s) Yamaha Blue; White with silver
USA: $6,149 (Team Yamaha Blue/White) Available from November 2006
$6,249 (White/Silver) Available from November 2006
*Price and specifications subject to change without notice.
Please read your Owner’s Manual and all labels before operation.