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Red Bluff Yamaha
The YAMAHA YZ250F - 2009
Staying one step ahead is what we do
For 2009, we bump the AMA Supercross Lites Champion YZ250F's aggression level even higher,
with changes to the exhaust and ignition systems that sharpen power delivery and response
off the bottom and midrange. then we made sure you could put it to the ground more
precisely than ever with subtle but significant chassis upgrades to what was already the
best-handling, best-suspended bike in the 250 class.
FEATURES
- Ongoing refinement to chassis produce an amazingly balanced,
light-handling machine with performance thats accessible to all levels of riders.
- Five-titanium-valve engine with 13.5:1 compression ratio spins out
great torque and horsepower.
- A carefully tuned aluminum frame made up of forgings, weldings,
castings and tubing means sharp, super-precise handling.
- Mass centralization provides fantastic overall balance and
performance.
- A ProTaper® aluminum handlebar in adjustable clamps and Excel rims
are just a few tricks up the YZ250Fs sleeve.
- Dry sump lubrication system circulates more oil for the best
durability in motocross
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- Redesigned exhaust system has a 60mm longer titanium header for
better low-end grunt plus a 50mm shorter aluminum silencer for optimum low-rpm throttle
response.
- Both carburetor jetting and CDI ignition mapping settings are
precisely reworked to deliver increased engine performance with new exhaust.
- New clutch eliminates the judder spring and uses a floating rubber
damper instead of a coil spring to provide unmatched clutch performance.
- New clutch eliminates the judder spring and uses a floating rubber
damper instead of a coil spring to provide unmatched clutch performance.
- Newly designed swingarm is lighter and helps to achieve excellent
rigidity balance for superb cornering and rear wheel traction.
- Lightweight suspension linkage is redesigned to match the new
swingarm.
- New rear wheel hub is lighter and designed for the larger 25mm
diameter axle (up from 22mm), helping to achieve the overall rigidity balance of rear
suspension components.
- New clutch lever is shorter, stronger, and lighter, with a lever
position adjuster to accommodate different riders. Quick adjuster makes maintenance easy.
- Front brake hose clamp is now aluminum, greatly reducing its weight.
- New seat cover has great grip and more durability, and its
easy to clean.
- Premium drive chain has gold colored plates for outstanding looks.
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- Liquid-cooled 250cc, five-titanium-valved, DOHC, four-stroke is
powerful and highly tractable, with an rpm redline for competition-crushing pulling power.
- 37mm Keihin® FCR flat-slide carburetor with throttle position
sensor (TPS) ensures precise fuel/air mixing and lightning-quick throttle response.
- Cylinder body and crankcase feature a large cutaway section to
reduce pumping loss and increase midrange performance.
- Primary kickstarting (with automatic decompression and convenient
handlebar-mounted hot start lever) ensures easy restarts.
- Slick, five-speed transmission with heavy-duty, multiplate clutch
features an involute spline setup, ensuring smooth shifting and instant hookup under
power.
- Magnesium cylinder head cover - now covered matte black - helps
shave weight.
- Trick, works-style clutch lever features race-spec barrel adjuster
for on-the-fly adjustability.
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- Extensively tested aluminum frame uses a mix of alloy castings,
forgings and extrusions to produce a tuned-flex frame that makes the YZ250F the
best-handling bike in its class.
- Speed-Sensitive System 48mm KYB® fork damping force is controlled
by piston speed: provides a smoother, more precise ride.
- Four-way adjustable, rear shock with Kashima-coated internals
reduces friction for fantastic compliance and great handling.
- Removable aluminum rear subframe is constructed of square-section
tubing for light weight and easy maintenance.
- Lightweight front wheel hub for reduced unsprung weight and
increased durability.
- Lightweight front and rear brake calipers with aluminum pistons and
anti-bubble front master cylinder; wave-style rotors reduce unsprung weight and deliver
strong stopping power.
- Lightweight 21-inch front and 19-inch rear Excel rims are
exceptionally durable and reduce unsprung weight.
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STATISTICS
| Type |
250cc liquid-cooled DOHC 4-stroke; 5 titanium valves |
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| Bore x Stroke |
77.0mm x 53.6mm |
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| Compression Ratio |
13.5:1 |
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| Carburetion |
Keihin FCR MX37 |
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| Ignition |
CDI |
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| Transmission |
Constant-mesh 5-speed; multiplate wet clutch |
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| Final Drive |
Chain Drive |
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| Suspension/Front |
Speed-Sensitive System inverted fork; fully adjustable, 11.8-in
travel |
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| Suspension/Rear |
Fully adjustable single shock; 12.0-in travel |
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| Brakes/Front |
Hydraulic single disc brake, 250mm |
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| Brakes/Rear |
Hydraulic single disc brake, 245mm |
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| Tires/Front |
80/100-21 Bridgestone® 403 |
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| Tires/Rear |
110/90-19 Bridgestone® 404 |
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| Length |
85.1 in |
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| Width |
32.5 in |
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| Height |
51.2 in |
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| Seat Height |
38.8 in |
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| Wheelbase |
57.8 in |
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| Ground Clearance |
14.6 in |
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| Wet Weight |
226 lb |
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| Fuel Capacity |
1.8 gal |
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| Warranty |
30 Day (Limited Factory Warranty) |
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