2010 Yamaha YZ Review


The 2010 Yamaha YZ series is a five-bike line of racing motorcycles with a lineage that dates back 36 years. The five-bike lineup includes the 2010 YZ450F, YZ250F, YZ250, YZ125, and YZ 85. Three two-strokes make a comeback in 2010 including YZ 85 for young riders, YZ125, and YZ250 along with the other two four-stroke bikes.

The YZ450F motocross model has an all-new avatar and breaks new grounds with technical innovations that could influence street bikes in the coming years. Even the YZ250F is a different and an improved version of the 2009 model. However, the 2010 Yamaha YZ two-stroke lineup returns unchanged. Overall, the Japanese-made off-road Yamaha YZ series continues to make pulses race while promising a comfortable, albeit exciting, ride. The four-strokes are available in Team Yamaha Blue/White as standard with an option of White/Red while the two-strokes are available only in Team Yamaha Blue/White.

New For 2010

Yamaha has made some radical changes and redesigns to the two four-stroke bikes. Some of the new changes include:

  • A newly designed fuel injected engine
  • Rearward slanting cylinder unit with innovative displacements of the traditional intake and exhaust positions
  • Aluminum bilateral beam chassis frame that improves centralization of machine mass for better handling performance
  • Cross-section swing arm chassis design made of aluminum parts
  • New dimensions adopted: handlebar mounts and foot pegs are higher to optimize rider position on the new chassis, and the wheelbase, caster, and trail dimensions have been optimized
  • Spring of the suspension unit has been lowered for straight intake passage
  • All new styling, emphasizing the bike's light weight and agility
  • Flat seat, fender, tank design
  • Plastic resin fuel tank under the seat
  • Exterior parts adopted include: front fender, rear fender, front number plate, front fork protector, side covers, air scoop, etc.
  • Digital power tuner

2010 Yamaha YZ Specs

  • Model: YZ450F, YZ250F, YZ250, YZ125, YZ 85
  • Engine Type: Liquid-cooled, four-stroke; liquid-cooled, four-stroke; liquid-cooled, two-stroke
  • Bore and Stroke: 97.0mm x 60.8mm; 77.0mm x 53.6 mm; 66.4mm x 72.0mm; 54.0mm x 54.5mm, 47.5mm x 47.8mm
  • Compression ratio: 12.5:1; 13.5:1; 8.6-10.7:1; 8.2:1
  • Valve Train: DOHC five-valve; DOHC four-valve; reed-valve inducted
  • Induction: Fuel injected
  • Ignition: Transistor Controlled Ignition (TCI); Capacitor Discharge Ignition (CDI)
  • Transmission: Return type five-speed forward; constant-mesh six-speed; multi-plate wet clutch
  • Final Drive: Chain
  • Fuel Capacity: 1.6 gallons; 2.1 gallons; 1.3 gallons
  • Estimated Fuel Economy: N/A
  • Brakes (Front): Hydraulic, single disc 250mm; 250mm petal disc, dual-piston caliper
  • Brakes (Rear): Hydraulic single disc brake, 245mm; 245mm petal disc, single-piston caliper
  • Suspension (Front): Kayaba Speed Sensitive System 47mm fork, 20-position compression and 20-position rebound damping adjustment; 12.2 inches travel; telescopic
  • Suspension (Rear): Kayaba gas charged shock, 20-position low-speed and step-less high-speed compression damping, 20-position rebound damping and adjustable spring preload; 12.4 inches travel; swing arm
  • Wheelbase: 58.7 inches; 57.7 inches
  • Rake: Caster Angle 27.20°; 27°
  • Trail: 119.9 mm; 118.7 mm
  • Seat Height: 39.3 inches; 38.9 inches
  • Curb Weight: 245 pounds
  • Tires (Front): 80/100-21 51M
  • Tires (Rear): 110/90-19 62M; 100/90-19 57M


  • GYTR by FMF® QuietCore™ spark arrestor insert
  • GYTR® ported cylinder head assembly (YZ450F)
  • Swing arm pivot bearing kits
  • Yamaha genuine OE gasket kits
  • Replacement VPS hand guards

Key Competitors For The 2010 Yamaha YZ

  • Honda CRF450R
  • Kawasaki KX450F
  • KTM 450 SX-F