- liquid-cooled 2-stroke; reed-valve inducted
- 249 L
The only choice for racing. When you’re talking two-stroke 250 performance, the choice is clear: YZ250.
The YZ250 is a 2-stroke motocross race bike made by Yamaha. It was launched in the 1970s, and has been regularly updated since. It is slowly being phased out and replaced by its more powerful four stroke rival, the YZ450.
The YZ250 was extensively redesigned for 2005, so has received mostly chassis updates for 2007, including revised Kayaba 48mm front forks as per the YZ450FF and YZ250F.
The legendary two-stroke Supercross winner is now more potent than ever. A light, aluminum frame housing a patented YPVS power-valve-equipped ripper of an engine results in an awesome power-to-weight ratio.
Winning just got easier. Out of the crate race "goodies" include a new ProTaper aluminum handlebar, titanium footpegs, gripper seat, Excel rims and a lightweight Beta titanium spring on the rear shock.
New for 2007
Modified thickness of both inner and outer fork tubes and revised damping settings.
Rear shock lightened by the use of aluminum components. Revised settings complement the changes in the fork.
A lightweight and strong Pro Taper aluminum handlebar in adjustable mounts adds comfort and control.
New jet needle in the 38mm Keihin PWK carburetor increases bottom-end and mid-range response.
Lighter box-head bolts are used throughout the chassis to ease maintenance and reduce weight.
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.
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.
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.
Type: 249cc liquid-cooled 2-stroke; reed-valve inducted
Bore x Stroke: 66.4 x 72.0mm
Compression Ratio: 9.2 – 10.9:1
Carburetion: PWK38S X 1
Transmission: Constant-mesh 5-speed; multiplate wet clutch
Final Drive: Chain Drive
Suspension/Front: Speed-Sensitive System inverted fork; fully adjustable, 11.8" Travel
Suspension/Rear: Fully adjustable single shock, 12.4" Travel
Brakes/Front: Hydraulic single disc brake, 250mm
Brakes/Rear: Hydraulic single disc brake, 245mm
Seat Height: 39.1"
Ground Clearance: 15.0"
Dry Weight: 211.6 lb.
Fuel Capacity: 2.1 gal.
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)