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Red Bluff Yamaha
YZ450F - 2009
The high-speed pursuit of perfection
Last season, the new 2008 YZ450F jumped right in by winning the AMA Motocross
Championship, then backed it up with the 2008 Supercross title. We decided to not fix what
wasn't borken, but that doesn't mean we didn't make a few changes to our flagship YZ. For
2009, the best-handling big-bore you can buy corners even sweeter, and looks even more
radical.
FEATURES
- The bike that started the four-stroke revolution benefits from
chassis refinements that ensure the five-titanium-valved YZ450F remains at the head of the
open-class pack.
- Subtle modifications to the suspension mean light, precise,
confident handling at any speed.
- Head and exhaust design delivers stronger low- to midrange power
without sacrificing top end power.
- Ready to race straight out of the cratewith a ProTaperŪ
aluminum handlebar in adjustable clamps, titanium shock spring, gripper seat, Excel rims,
etc.
- Five-speed gearbox provides maximum flexibility and the right gear
for a wide range of riding environments.
- Dry sump lubrication system circulates more oil for the best
durability in motocross.
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- Top triple clamp has two sets of mounting holes, providing 4
handlebar positions to suit a wide variety of riders: standard, 10mm back, or 10mm or 20mm
forward.
- 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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- 449cc, five-valve, DOHC, liquid-cooled engine is super-powerful yet
tractable.
- 39mm Keihin FCR flat-slide carburetor with throttle position sensor
(TPS) and leak jet delivers precise fuel/air mixture and instant throttle response.
- Lightweight titanium valves and load-reduced springs minimize
reciprocating mass for fast-revving, hard-hitting power delivery across the rev range.
- Primary kickstarting with automatic decompression and convenient,
handlebar-mounted hot start lever ensures easy restarts.
- Large-capacity radiator is reinforced for greater strength.
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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 YZ the
finest-handling motocross bike ever.
- Speed-Sensitive System 48mm KYBŪ fork damping force is controlled
by piston speed: provides a smoother, more precise ride.
- Titanium-sprung, four-way adjustable rear shock with Kashima-coated
internals reduces friction for fantastic compliance and great handling.
- More weight savings come via two-piece (part aluminum, part plastic)
engine protector plates and thin-walled engine guard construction.
- Removable aluminum rear subframe 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.
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- Wide (55mm) footpegs provide excellent boot traction and rider
comfort.
- ProTaperŪ aluminum handlebar for strength and performance.
- Works-style clutch lever features oversize barrel adjuster for easy,
on-the-fly adjustability of lever/cable play.
- Repackable exhaust silencer.
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STATISTICS
| Type |
449cc liquid-cooled DOHC 4-stroke; 5 titanium valves |
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| Bore x Stroke |
95.0 x 63.4mm |
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| Compression Ratio |
12.3:1 |
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| Carburetion |
Keihin FCR MX39 |
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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; 12.3-in travel |
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| Brakes/Front |
Hydraulic single disc brake, 245mm |
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| Brakes/Rear |
Hydraulic single disc brake, 245mm |
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| Tires/Front |
80/100-21-Dunlop 742FA |
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| Tires/Rear |
120/80-19-Dunlop 756 |
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| Length |
86.4 in |
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| Width |
32.5 in |
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| Height |
51.4 in |
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| Seat Height |
38.9 in |
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| Wheelbase |
58.8 in |
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| Ground Clearance |
14.7 in |
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| Fuel Capacity |
1.8 gal |
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| Wet Weight |
238 lb |
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| Warranty |
30 Day (Limited Factory Warranty) |
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