2007 Yamaha YZ Review

Intro

Yamaha, the Japanese motorcycle manufacturer, introduced the original YZ motocross bikes in the 1970s. In fact, Yamaha created the very first single-shock production motocross bike. The line was expanded, altered, and revised substantially over the years. The YZ 85 was in production from 2000 to 2008; the 2007 model was a carryover. The YZ 125 was introduced in 1974; it was revised in 2005, and that model was carried over in 2007. The 250 was also introduced in 1974; it was revised in 2006. The 250F was released in 2001 and produced until 2008; it was revised in 2006 and carried over for 2007. The YZ 450F was made between 2003 and 2008.

All five models are powered by four-stroke, air-cooled, single-cylinder, carbureted engines. The numbers tell you how powerful each engine is: the 85's engine displaces 84 ccs, the 125 displaces 124 ccs, the 250 and 250F displace 244ccs, and the 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. All models' front suspension is supplied by inverted forks with rebound damping; the rear suspension is twin-sided swing with an adjustable spring preload and rebound damping. All have kick starters. The YZ 85 and 125 have six-speed transmissions; the other three models have five-speed manual trannies.

Riders could choose to customize their bikes with a wide array of accessories, including switching out the clutch lever and adding fork guards. All models competed successfully in motocross throughout the years in which they were produced.

New For 2007

  • N/A

2007 Yamaha YZ Specs

  • Model: YZ 85, YZ 125, YZ 250, YZ 250F, YZ 450F
  • Engine Type: 84cc (YZ 85); 124cc (YZ 125); 249cc (YZ 250 & 250F); 450cc (YZ 450F), liquid-cooled single cylinder
  • 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 2.1 inches (YZ 250F); 3.74 inches x 2.5 inches (YZ 450F)
  • Compression ratio: 8:2:1 (YZ 85); 8:6:1 (YZ 125);
  • Valve Train: Reed valve (YZ 85, 125 & 250); DOHC (YZ 250F & 450F)
  • Induction: Carburetor
  • Ignition: Kick (YZ 85);
  • Transmission: Six-speed manual (YZ 85 & 125; five-speed manual (YZ 250, 250F & 450F)
  • Final Drive: Chain
  • Fuel Capacity: 1.3 gallons (YZ 85); 2.1 gallons (YZ 125, 250 & 250F); 1.8 gallons (YZ 450F)
  • Estimated Fuel Economy: N/A
  • Brakes (Front): 7.8-inch disc (YZ 85); 9.9-inch disc (YZ 125, 250 & 3450); 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 225); 57.8 inches (250F); 58.8 inches (YZ 450F)
  • Rake: N/A
  • Trail: N/A
  • Seat Height: 31.9 inches
  • Curb Weight: 146 pounds (YZ 85); 190 pounds (YZ 125); 211.6 pounds (YZ 250); 204 pounds (YZ 250F); 220 pounds (YZ 400)
  • Tires (Front): 70/100 R17 (YZ 85); 80/100 R21 (YZ 125, 250, 250F & 450F);
  • Tires (Rear): Dunlop 90/100 R14 (YZ 85); 100/90 R19 (YZ 125, 250, 250F & 450F)

Accessories

  • Aluminum Hot Start Lever
  • Carbon Fiber Upper Fork Guards
  • GYT-R Pivoting Clutch Lever
  • Rear Brake Master Cylinder Guard
  • Titanium Foot Pegs
  • GYT-R Mini Cross Bar Pad Various Styles
  • GYT-R Billet Clutch Lever With Roller Bearing
  • GYT-R Factory Clutch Perch Assembly With Hot Start
  • Yamaha Factory Racing Clamp Cover Various Styles

Key Competitors For The 2007 Yamaha YZ

  • 2007 Honda CR 85
  • 2007 Suzuki DR-Z 250
  • 2007 Kawasaki KX 125
  • 2007 Honda CR 450R