Key Features:
- Our legendary two-stroke Supercross winner is more potent than ever.
- Winner of "Cycle World", "Racer X" and "Motocross Action" shootouts.
- A light, aluminum frame housing a patented YPVS™ power-valve-equipped ripper of an engine results in an awesome power-to-weight ratio.
- Ready to race out of the crate, complete with new ProTaper aluminum handlebar, titanium footpegs, gripper seat and Excel rims
New for 2007:
-
Modifying thickness of both inner and outer fork tubes and revising damping settings provides fantastic bump absorption and comfort while shaving weight.
- Lightening the rear shock with aluminum components takes off more weight, and revised settings complement the ones in the fork.
- A light and strong ProTaper aluminum handlebar in adjustable mounts adds comfort and control.
- A new jet needle in the 38mm Keihin PWK carburetor boosts bottom-end and mid-range response.
- Use of lighter, box-head bolts throughout the chassis eases maintenance while reducing weight and increasing performance.
Engine:
- 249cc liquid-cooled, reed valve-inducted two-stroke engine is lightweight, compact and features an incredibly wide, hard-hitting powerband.
- Patented YPVS power valve system combines crisp, hard-hitting bottom-end acceleration with strong midrange and eye-opening top-end.
- Special-design carbon fiber reed-valve pedals improve throttle response and engine performance across the entire rpm range.
- Smooth-shifting, five-speed, close-ratio transmission with heavy-duty, multiplate clutch.
- Primary kickstarter ensures smooth, easy starting action and reduced weight.
- Large-capacity radiator features a ten-row core with four louvers for maximum cooling efficiency.
- 38mm Keihin PWK carburetor with power jet and throttle position sensor (TPS) ensure precise fuel/air mixing and extra-crisp throttle response throughout the powerband.
- Digital CDI ignition system delivers precise spark for faster, stronger response anywhere in the powerband.
- Trick, works-style clutch lever features race-spec barrel adjuster for on-the-fly adjustability.
Chassis/Suspension:
- A carefully engineered, advanced aluminum frame and swingarm give the YZ250 the best handling in the 250 class.
- Speed-Sensitive System 48mm Kayaba fork tubes move the transfer control valves (TCV) above the fork springs, so that damping force is controlled by piston speed instead of position. Along with a bigger base valve hole, the result is a smooth ride and super-precise handling.
- Removable aluminum rear subframe constructed of square-section tubing for reduced weight.
- Rear, fully adjustable Kayaba shock features a super-light titanium shock spring and reduced-friction Kashima coating of internals. 12.4 inches of travel, separate adjusters for high- and low-speed compression damping, and a full lock oil rebound system for increased comfort all add up to fantastic rear wheel control and a sweet ride.
- Lightweight front and rear calipers with aluminum pistons and anti-bubble front master cylinder, 250mm fully floating front and 245mm rear discs, deliver strong stopping power with progressive feel.
- Lightweight 21-inch front and 19-inch rear Excel rims provide exceptional durability and help reduce unsprung weight for optimal suspension performance and handling.
- Tapered rear wheel spacers ease sliding the rear wheel into place, for quicker tire changes.
- Premium Dunlop knobbies offer race-spec traction and wear.
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Additional Features:
- Wide, cleated, folding titanium footpegs are lightweight and provide excellent comfort, grip and ground clearance.
- Special-design “gripper” type seat and fuel tank, forward-canted steering crown and low handlebar provide excellent movement and more comfortable ergonomics for riders.
- Wide-diameter fuel tank cap ensures easier usage, while larger tank opening means faster, hassle-free refueling.
- Cleated rear brake lever and folding shift lever tip offer superb grip and exceptional durability.
- Repackable exhaust silencer.
- Durable, comfortable handlebar grips.
- Stainless steel clutch cable for longer life.
| SPECIFICATIONS |
2007 YZ250 |
ENGINE |
| Engine
Type |
249cc, liquid-cooled 2-stroke reed valve |
| Bore
and Stroke |
66.4 x 72mm |
| Compression
Ratio |
9.2 – 10.9:1 |
| Carburetion |
PWK38S X |
| Fuel System |
MikuniTM VM12 |
| Ignition |
CDI |
DRIVE TRAIN |
| Transmission |
Constant mesh 5-speed/Wet, multiple-disc coil spring |
| Final Drive |
Chain Drive |
|
CHASSIS
/ SUSPENSION / BRAKES
|
| Front
Suspension |
Telescopic Fork, coil spring/oil damper, 11.8" Travel |
| Rear
Suspension |
Swingarm (link, suspension), coil spring/gas-oil damper, 12.4" Travel |
| Front
Brake |
Hydraulic single disc brake, 250mm |
| Rear
Brake |
Hydraulic single disc brake, 245mm |
| Front
Tire |
80/100-21-51M |
| Rear
Tire |
110/90-19-62M |
|
DIMENSIONS
|
| Overall Length |
85.7" |
| Overall Width |
32.6" |
| Overall Height |
51.4" |
| Seat Height |
39.1" |
| Ground Clearance |
15.0" |
| Wheelbase |
58.3" |
| Dry Weight |
211.6 lb |
| Fuel
Capacity |
2.1 gal. |
|
OTHER
|
| Other Main Jet |
#178 |
| Main Air Jet |
#200 |
| Jet Needle |
N3EW-2 |
| Needle Jet |
2.9 |
| Pilot Air Jet 1 |
#50 |
| Pilot Outlet |
0.8 |
| Pilot Jet |
#50 |
| Primary Reduction Ratio |
63/21 (3.000) |
| Secondary Reduction Ratio |
50/14 (3.571) |
| Gear Ratio - 1st Gear |
27/14 (1.929) |
| Gear Ratio - 2nd Gear |
23/15 (1.533) |
| Gear Ratio - 3rd Gear |
23/18 (1.278) |
| Gear Ratio - 4th Gear |
24/22 (1.091) |
| Gear Ratio - 5th Gear |
20/21 (0.952) |
Warranty 30 Day (Limited Factory Warranty) |
MSRP* $6,299 (Team Yamaha Blue/White) Available from July 2006 |
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