FIRST LOOK! THE 2011 YAMAHA MOTOCROSS BIKES; YZ450F, YZ250F, YZ250, YZ125 & YZ85

On Jul 6, 2010 Last updated Feb 17, 2018

Yamaha has not officially released photo of the 2011 Yamaha motocross bikes, but MXA‘s buddies in England were kind enough to send us the photos that they received from the European distributor. Don’t get us wrong, these are not official Yamaha USA photos, but they are the real deal. All the tech info is to the Euro spec.

2011 YZ450F: Red and white.

The left side of the 2011 YZ450F.

The right side of the 2011 YZ450F.

2011 YZ450F: Blue and white (with the exception of the red & white YZ450 all the American YZ’s will have sliver rims).

2011 YZ450F.

Proof that the 2011 YZ450F runs.

2011 YZ450F SPECS

YZ450F FEATURES:
    * Rearward-slanting, 450cc, 4-valve engine
    * Aluminum Bilateral Beam frame
    * Ergonomic design for easier riding
    * Fuel injection for optimum air-fuel ratios
    * Rigid rear wheel spokes
    * GYTR Power Tuner (optional accessory)

YZ450F ENGINE:
Engine type: Liquid cooled 4-stroke, DOHC, 4-valve, rearward slanting single cylinder
Displacement: 449.7 cc
Bore x stroke: 97.0 x 60.8 mm
Compression ratio: 12.5:1
Lubrication system: Dry sump
Fuel System: Keihin fuel injection
Clutch type: Wet, multiple-disc
Ignition system: Full Transistor
Starter system: Kick
Transmission system: Constant mesh, 5-speed
Final transmission: Gear
Fuel tank capacity: 6.2 L
Oil tank capacity: 1.2 L

YZ450F CHASSIS:
Chassis: Bilateral Beam frame
Front suspension: Telescopic forks
Front travel: 310 mm
Rear suspension: Swingarm (link suspension)
Rear travel: 312 mm
Caster angle: 26ø 47′
Trail: 117.5 mm
Front brake: Single disc, ? 250 mm
Rear brake: Single disc, ? 245 mm
Front tire: 80/100-21 51M
Rear tire: 110/90-19 62M

YZ450F DIMENSIONS:
Length: 2,191 mm
Width: 825 mm
Height: 1,311 mm
Seat height: 999 mm
Wheel base: 1,487 mm
Minimum ground clearance:383 mm
Wet weight: 111.9 kg

2011 YZ250F.

2011 YZ250F with carb.

Close up of the skid plate.

2011 YZ250F SPECS

YZ250F FEATURES:
    * Lightweight Bilateral Beam aluminium frame
    * Improved mass-centralisation for better handling
    * 4-stroke DOHC single-cylinder 250cc 5-valve engine
    * Long-stroke suspension for traction and road feel
    * New generation competition styling

YZ250F ENGINE:
Engine type: Liquid-cooled, 4-stroke, forward-inclined single cylinder, 5-valves, DOHC
Displacement: 250 cc
Bore x stroke: 77.0 x 53.6 mm
Compression ratio: 13.5 : 1
Lubrication system: Dry sump
Carburetor: Keihin FCR-MX 37mm
Clutch type: Wet, multiple-disc
Ignition system: CDI
Starter system: Kick
Transmission system: Constant mesh, 5-speed
Final transmission: Chain
Fuel tank capacity: 6.4 L
Oil tank capacity: 1.2 L

YZ250F CHASSIS:
Chassis: Aluminum Bilateral Beam
Front suspension: Telescopic forks
Front travel: 300 mm
Rear suspension: Swingarm (link suspension)
Rear travel: 310 mm
Caster angle: 27§ 10′
Trail: 117.4 mm
Front brake: Single disc, ? 250 mm
Rear brake: Single disc, ? 245 mm
Front tire: 80/100-21-51M
Rear tire: 100/90-19 57M

YZ250F DIMENSIONS:
Length: 2,168 mm
Width: 825 mm
Height: 1,304 mm
Seat height: 991 mm
Wheel base: 1,473 mm
Minimum ground clearance: 377 mm
Wet weight: 102.8 kg

2011 YZ250 two-stroke.

2011 YZ250.

The YZ250 from the rear.

2011 YZ250 TWO-STROKE SPECS

YZ250 ENGINE:
Engine type: Liquid-cooled, 2-stroke, forward-inclined single cylinder, reed valve, with YPVS
Displacement: 249 cc
Bore x stroke: 66.4 x 72.0 mm
Compression ratio: 8.9 – 10.6 : 1
Lubrication system: Premix
Carburetor: Keihin PWK 38mm
Clutch type: Wet, multiple-disc coil spring
Ignition system: CDI
Starter system: Kick
Transmission system: Constant mesh, 5-speed
Final transmission: Chain
Fuel tank capacity: 8 L
Oil tank capacity: 0.8 L

YZ250 CHASSIS:
Chassis: Aluminum semi-double cradle
Front suspension system: Telescopic forks
Front travel: 300 mm
Rear suspension: Swingarm (link suspension)
Rear travel: 315 mm
Caster angle: 27.1§
Trail: 118 mm
Front brake: Single disc, ? 250 mm
Rear brake: Single disc, ? 245 mm
Front tire: 80/100-21 51M
Rear tire: 110/90-19 62M

YZ250 DIMENSIONS:
Length (mm): 2,184 mm
Width (mm): 827 mm
Height (mm): 1,309 mm
Seat height (mm): 997 mm
Wheel base (mm): 1,481 mm
Minimum ground clearance (mm): 385 mm
Service weight (kg): 103.9 kg

2011 YZ125.

2011 YZ85.