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2008 Yamaha YZ450F
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Overview

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OUR MOST POWERFUL, MOST FLICKABLE 450 EVER.


The bike that started the four-stroke revolution keeps moving forward with chassis and engine refinements that ensure the five-titanium-valved YZ450F remains at the head of the open-class pack.

  • The bike that started the four-stroke revolution benefits from chassis and engine refinements that ensure the five-titanium-valved YZ450F remains at the head of the open-class pack.
  • Subtle modifications to the aluminum frame and suspension mean light, precise, confident handling at any speed.
  • New head and exhaust design delivers stronger low- to midrange power without sacrificing top end power.
  • Ready to race straight out of the crate—with a ProTaper 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.
New for 2008
  • Revised intake port shapes, and revised intake and exhaust cam profiles increase combustion efficiency for improved torque and throttle response in the low- to mid-rpm range.
  • Micron-level adjustment of piston external diameter minimizes piston-to-cylinder clearance for reduced vibration and mechanical noise.
  • Adjustment of gear backlash between clutch primary gears and balancer gears achieves further mechanical noise reduction.
  • A new, larger-diameter titanium exhaust header with revised taper characteristics enhances exhaust efficiency.
  • First “punched cone” muffler ever on a production bike allows 35 percent length reduction and 270-gram weight reduction while meeting AMA noise regulations.
  • Matte black crankcase covers: light, strong and cool-looking.
  • Steering head pipe and steering stem are 5mm shorter; lower forged triple steering clamp is lighter—for enhanced handling feel. Swingarm pivot stiffness is revised to complement front-end changes and further lighten and improve steering/handling.
  • Changes to the shape of the outer fork tubes and revised internals result in improved damping and a smoother ride.
  • Optimized linkage ratio provides a smoother ride and enhanced rear wheel traction.
  • New, YZ250F-style, front-brake caliper (-220 grams) and a lighter disc remove unsprung weight and provide excellent stopping power. A new axle and collar remove additional weight.
  • A 120/80-19 rear Dunlop D756 knobby replaces the 110/90-19 for even more traction. A D742FA replaces the D739FAL front tire.
  • Wider footpegs provide excellent boot traction and rider comfort.
Engine
  • 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.
Chassis/Suspension
  • 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 Kayaba fork places transfer control valves (TCV) above the fork springs, so that damping force is controlled by piston speed: Eliminating mid-stroke damping force changes 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.
Additional Features
  • “Gripper” style seat cover gives excellent feel and control.
  • ProTaper 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.
  • Durable, comfortable handlebar grips.
Engine Specificaions
  • Type: 449cc liquid-cooled DOHC 4-stroke; 5 titanium valves
  • Bore x Stroke: 95.0 x 63.4mm
  • Compression Ratio: 12.3:1
  • Carburetion: FCR-MX39 x 1
  • Ignition: CDI
  • Transmission: Constant-mesh 5-speed; multiplate wet clutch
  • Final Drive: Chain Drive
Chassis Specificaions
  • Suspension/Front: Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
  • Suspension/Rear: Fully adjustable single shock; 12.3-in travel
  • Brakes/Front: Hydraulic single disc brake, 250mm
  • Brakes/Rear: Hydraulic single disc brake, 245mm
  • Tires/Front: 80/100-21-51M
  • Tires/Rear: 120/80-19-62M
Dimensions
  • Length: 86.4 in
  • Width: 32.5 in
  • Height: 51.4 in
  • Seat Height: 38.9 in
  • Wheelbase: 58.8 in
  • Ground Clearance: 14.7 in
  • Dry Weight: 219 lb
  • Fuel Capacity: 1.8 gal
Warranty
  • 30 Day (Limited Factory Warranty)
Color
  • Team Yamaha Blue/White
  • White/Red
NOTES:

Price and specifications subject to change without notice. Please read your Owner's Manual and all labels before operation.


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Year
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Price
2008 Yamaha TTR 125 LE Dirt Bikes 2008 BLUE $1,999.00
2007 Yamaha TT-R 125 LE Dirt Bikes 2007 BLUE/WHITE $1,999.00
2009 Yamaha TTR 230 Dirt Bikes 2009 BLUE/WHT $3,299.00
2011 Yamaha TTR110 Dirt Bikes 2011 BLUE/WHITE $2,150.00
2011 Yamaha TT-R110 Dirt Bikes 2011 BLUE / WHITE $2,150.00
2009 Yamaha TTR230Y Dirt Bikes 2009 BLUE/WHT $3,299.00
2010 Yamaha YZ 250 Dirt Bikes 2010 BLUE/WHITE $6,399.00
2008 Yamaha YZ 85 Dirt Bikes 2008 BLUE $2,499.00
2007 Yamaha YZ450F Dirt Bikes 2007 WHITE $2,599.00
This motorcross bike comes equipped with a Two Brothers Pipe.

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Specifications

Engine
Engine Type DOHC 4-stroke; 5 titanium valves
Displacement 449cc
Bore and Stroke 95.0 x 63.4mm
Cooling Liquid-cooled
Compression Ratio 12.3:1
Fuel System Carburetion: FCR-MX39 x 1
Ignition CDI
Chassis
Front Suspension Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel
Front Brakes Hydraulic single disc brake, 250mm
Front Tire 80/100-21-51M
Rear Suspension Fully adjustable single shock; 12.3-in travel
Rear Brakes Hydraulic single disc brake, 245mm
Rear Tire 120/80-19-62M
Dimensions
Dry Weight 219 lb
Fuel Capacity 1.8 gal
Wheelbase 58.8 in
Ground Clearance 14.7 in
Seat Height 38.9 in
Transmission
Transmission Constant-mesh 5-speed; multiplate wet clutch
Final Drive Chain Drive
General
Colors Team Yamaha Blue/White, White/Red
Warranty 30 Day (Limited Factory Warranty)

Compare Models

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Year 2008    
Manufacturer Yamaha    
Model YZ450F    
Style Motocross    
MSRP* $7,199.00    
Chassis
Front Suspension Speed-Sensitive System inverted fork; fully adjustable, 11.8-in travel    
Front Brakes Hydraulic single disc brake, 250mm    
Front Tire 80/100-21-51M    
Rear Suspension Fully adjustable single shock; 12.3-in travel    
Rear Brakes Hydraulic single disc brake, 245mm    
Rear Tire 120/80-19-62M    
Dimensions
Dry Weight 219 lb    
Fuel Capacity 1.8 gal    
Wheelbase 58.8 in    
Ground Clearance 14.7 in    
Seat Height 38.9 in    
Trail      
Rake      
Engine
Engine Type DOHC 4-stroke; 5 titanium valves    
Displacement 449cc    
Bore and Stroke 95.0 x 63.4mm    
Cooling Liquid-cooled    
Compression Ratio 12.3:1    
Fuel System Carburetion: FCR-MX39 x 1    
Ignition CDI    
General
Colors Team Yamaha Blue/White, White/Red    
Warranty 30 Day (Limited Factory Warranty)    
Transmission
Transmission Constant-mesh 5-speed; multiplate wet clutch    
Final Drive Chain Drive    

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