2008 Yamaha YZ 450F

Motorcyclist Online helps you research the used 2008 Yamaha YZ 450F before buying this Motocross bike. The 2008 YZ 450 F is made in Japan. With front Hydraulic Disc brakes that will securely stop this YZ450F motorcycle on demand. It comes standard ...     read more
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2008 Yamaha YZ 450 F

Model Overview:

2008 YZ 450F

Bodystyle Motocross
Warranty 1 months
Manufacturer Country Japan
Introduction Year N/A
Displacement (cc) 449
Engine Type Single-Cylinder
Nextstep Bg

2008 Yamaha YZ 450F

Intro

Yamaha, the Japanese motorcycle manufacturer, introduced the original YZ motocross bikes in the 1970s. The line was expanded, altered, and revised substantially over the years. The YZ 85 was introduced in 2002; the 2008 model was a carryover. The YZ 125 was introduced in 1974; it was revised in 2008. The 250 was also introduced in 1974; it too was revised in 2008, when it was among the last of the 250cc, two-stroke, off-road bikes manufactured. The 250F and YZ 450F were upgraded in 2008.

All five models are powered by liquid-cooled, single-cylinder, carbureted engines. The numbers tell you how powerful each engine is: the YZ 85 has a two-stroke engine that displaces 84 ccs, the two-stroke 125 displaces 124 ccs, the two-stroke 250 and four-stroke 250F displace 249 ccs, and the four-stroke 450’s displacement is 449 ccs. Three models have reed valve setups; the 250F and 450F have dual overhead cams and Yamaha’s famous five-valve configuration. Disc brakes front and back provide stopping power. The models’ front suspensions are supplied by inverted forks with rebound damping; the rear suspension is a twin-sided swing arm with an adjustable spring preload and rebound damping. All have kick starters. The YZ 85 and 125 have six-speed transmissions; the YZ 250, 250F, and 450F have five-speed manual transmissions.

Yamaha makes a wide array of accessories for each model.

New For 2008
  • The YZ 250 changes with a larger fork spring, a new compression valve, shorter fork stanchions, and lighter guards that wrap farther around.
  • The YZ 125 also got a revised Kabaya fork, a new floating front disc brake with a twin-piston caliper, and a new intake manifold.
  • The 250F’s redesigned piston boosted the compression ratio, the Kabaya shock got a revised linkage ratio, and the foot pegs were repositioned.
  • Tweaks to the YZ 450F include an updated engine, a shorter muffler, and many small alterations that reduced the overall weight of the bike by a pound.

2008 Yamaha YZ Specs

  • Model: YZ 85, YZ 125, YZ 250, YZ 250F, YZ 450F
  • Engine Type: 84.7cc, liquid-cooled, single-cylinder, two-stroke (YZ 85); 124cc liquid-cooled, single-cylinder, two-stroke (YZ 125); 249cc, liquid-cooled, single-cylinder, two-stroke (YZ 250); 249cc, liquid-cooled, single-cylinder, four-stroke (YZ 250F); 449cc, liquid-cooled, single-cylinder, four-stroke (YZ 450F)
  • Bore and Stroke: 1.87 inches x 1.89 inches (YZ 85); 2.13 inches x 2.15 inches (YZ 125); 2.62 inches x 2.84 inches (YZ 250); 3.03 inches x 2.11 inches (YZ 250F); 3.74 inches x 2.5 inches (YZ 450F)
  • Compression ratio: 8:2:1 (YZ 85); 8:6:1 (YZ 125); 9:2:1 (YZ 250); 13:5:1 (YZ 250F); 12:3:1 (YZ 450)
  • Valve Train: Reed valve (YZ 85, 125 & 250); DOHC (250F & 450F)
  • Induction: Carburetor
  • Ignition: Kick
  • Transmission: Six-speed manual (YZ 85 & 125); five-speed manual (YZ 250, 250F & YZ 450F)
  • Final Drive: Chain
  • Fuel Capacity: 1.3 gallons (YZ 85); 2.1 gallons (YZ 125, 250); 1.8 gallons (YZ 250F & 450F)
  • Estimated Fuel Economy: N/A
  • Brakes (Front): 7.8-inch disc (YZ 85); 9.9-inch disc (YZ 125, 250 & 450); 9.8-inch disc (YZ 250F)
  • Brakes (Rear): 5.8-inch disc (YZ 85); 9.7-inch disc (YZ 125, 250, 250F & 450F)
  • Suspension (Front): Inverted fork with adjustable rebound damping
  • Suspension (Rear): Twin-sided swing arm with adjustable spring preload shock and rebound damping
  • Wheelbase: 49.5 inches (YZ 85); 56.8 inches (YZ 125); 58.3 inches (YZ 250); 57.8 inches (250F); 58.8 inches (YZ 450F)
  • Rake: N/A
  • Trail: N/A
  • Seat Height: 34 inches (YZ 85); 39.1 inches (YZ 125); 39.1 inches (YZ 250); 38.8 inches (YZ 250F); 38.9 inches (YZ 450F)
  • Curb Weight: 146 pounds (YZ 85); 190 pounds (YZ 125); 212 pounds (YZ 250); 204 pounds (YZ 250F); 219 pounds (YZ 450F)
  • Tires (Front): 70/100 R17 (YZ 85); 80/100 R21 (YZ 125, 250, 250F & 450F)
  • Tires (Rear): 90/100 R14 (YZ 85); 100/90 R19 (YZ 125, 250& 250F); 120/80 R19 (450F)

Accessories

  • Aluminum Hot Start Lever
  • Billet Shorty Clutch Lever
  • Enduro Skid Plate
  • GYT-R Brush Deflectors
  • GYR-R Clutch Play Quick Adjuster
  • GYT-R Cross Bar Pad
  • GYT-R Pivoting Front Brake Lever
  • Rear Brake Master Cylinder Guard
  • Titanium Foot Pegs
  • Utility Bag

Key Competitors For The 2008 Yamaha YZ

  • Honda CR 80F
  • KTM 125 EXC
  • Honda CRF 450X
  • Suzuki RM 250
  • KTM 450 EXC-R

Available YZ Sub Models

2008 Yamaha YZ 85 Buyer's Guide 2008 Yamaha YZ 85
Bodystyle:
Off-Road
HP/Torque:
N/A / N/A
2008 Yamaha YZ 250F Buyer's Guide 2008 Yamaha YZ 250F
Bodystyle:
Off-Road
HP/Torque:
N/A / N/A
2008 Yamaha YZ 125 Buyer's Guide 2008 Yamaha YZ 125
Bodystyle:
Off-Road
HP/Torque:
N/A / N/A
2008 Yamaha YZ 250 Buyer's Guide 2008 Yamaha YZ 250
Bodystyle:
Off-Road
HP/Torque:
N/A / N/A
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