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In the early 2000’s, the Government passed new emission laws making it very difficult for OEM manufacturers to keep 2-stroke engines in production. Yamaha like everyone else had to come up with an engine that would comply with these new restrictions. With 4-stroke engines meeting these regulations much more easily, Yamaha took the already well-loved YZ line, rebuilt it with a 4-stroke motor, and re-named it to YZ-F.

2005 Yamaha YZ250F

2012 Yamaha YZ250F White

The YZ-F is Yamaha’s supercross bike featuring a close gear ratio transmission and harder suspension than the WR-F. Built specifically for tracks, it has no lights or electric start, and is for off-road use only. It is comparable to Suzuki’s RM-Z line and Honda’s CRF-R models.


YZ-F Model Variations

 

YZ250F, 2001-2005

•    250cc
•    4-stroke
•    Single cylinder
•    DOHC
•    12.5:1 Compression ratio
•    Water cooled
•    Carbureted
•    Digital Ignition
•    Kick start

YZ250F, 2005-2007

•    Recreated the frame to be all aluminum instead of steel

YZ250F, 2008-2012

•    Boosted compression ratio to 13.5:1

YZ250F, 2014

•    Fuel injected
•    Titanium Valves

YZ450F, 2003-2005

•    449cc
•    DOHC
•    Five titanium valves
•    52 horse power
•    Water cooled
•    Steel frame
•    Weighed 233 lbs
•    4-speed transmission

YZ450F, 2006-2009

•    Revised engine for smoother power-band
•    5-speed transmission
•    Aluminum frame
•    Reduced weight by over 10lbs



YZ450F, 2010-2013

•    Fuel Injection
•    Rearward-slanted cylinder design
•    Four titanium valves
•    Better ECU programming
•    Upgraded seat foam for more cushion

YZ450F, 2014

•    New wrap-around exhaust
•    Exhaust wraps around the engine for more centralized mass
•    Better ignition mapping

 

Comparable to Honda’s CRF-X models, the WR-F is Yamaha’s enduro or trail bike. It is basically the same bike as the YZ-F but has a headlight, taillight, softer suspension than the YZ-F, and a wide gear ratio transmission. (WR stands for Wide Ratio)

2005 Yamaha WR250F

2013 Yamaha WR450F

WR-F Model Variations

 

WR250F, 2001-2005

•    Same basic bike as the YZ250F
•    Detuned engine for more controllable power
•    Larger radiator
•    Kick stand
•    Same steel frame
•    Wide-ratio gear box
•    Head light
•    Tail light

WR250F, 2006-2008

•    Automatic Decompressor
•    Aluminum frame
•    Digital display in 2007

 

WR250F, 2009-2012

•    Electric starter added

WR250F, 2013

•    Light-weight, aluminum muffler
•    Fully adjustable 48mm Kayaba front forks
•    Wave-style brake rotors front and rear
•    Airbox redesigned to be open-able without tools for easy filter removal


WR450F, 2003-2005

•    Same basic bike as the YZ450F
•    De-tuned engine for more controllable power
•    Softer suspension than the YZ450F
•    Carbureted
•    449cc
•    DOHC
•    Single cylinder
•    Five titanium valves
•    Water cooled
•    Wide-ratio gear box
•    Electric start
•    Headlight
•    Taillight
•    Kick stand
•    Steel frame

WR450F, 2006-2009

•    Renthal handlebars
•    Front wheel collar added for easy removal/installation
•    Removable aluminum rear sub-frame
•    Stylish Team-Yamaha inspired two-tone seat
•    Aluminum frame
•    5-speed transmission
•    Digital speedometer

WR450F, 2010-2013

•    More modern body styling
•    Revised “Gripper” seat cover
•    Automatic decompression system
•    Magnesium cylinder head to reduce weight

WR450F, 2014

•    4 titanium valves
•    Fuel Injection
•    Constant-mesh, multi-plate, wet clutch

 

Yamaha YZF Specs

Tires, Battery, and Spark Plug

Yamaha YZ-F Specs

2001-2013 YZ250F

Front Tires 80x100x21

Rear Tires 100x90x19

Battery None

Spark Plug CR8E

Yamaha YZ-F Specs

2006 YZ250FSP (50th Anniversary)

Front Tires 80x100x21

Rear Tires 100x90x19

Battery None

Spark Plug CR8E

Yamaha YZ-F Specs

1998-1999 YZ400F

Front Tires 80x100x21

Rear Tires 110x90x19

Battery None

Spark Plug CR8E

Yamaha YZ-F Specs

200-2002 YZ426F

Front Tires 80x100x21

Rear Tires 110x90x19

Battery None

Spark Plug CR8E

Yamaha YZ-F Specs

2003-2013 YZ450F

Front Tires 80x100x21

Rear Tires 110x90x19 (2003-2007)

Rear Tires 120x80x19 (2008-2013)

Battery None

Spark Plug CR8E

Yamaha YZ-F Specs

2006 YZ450FSP (50th Anniversary)

Front Tires 80x100x21

Rear Tires 110x90x19

Battery None

Spark Plug CR8E

Yamaha WR-F Specs

2001-2013 WR250F

Front Tires 80x100x21

Rear Tires 100x100x18

Battery YTX5L-BS (2003-2007)

Battery YTZ7S (2008-2013)

Spark Plug CR9E

Yamaha WR-F Specs

1998-2000 WR400F

Front Tires 80x100x21

Rear Tires 110x100x18

Battery None

Spark Plug CR8E

Yamaha WR-F Specs

2001-2002 WR426F

Front Tires 80x100x21

Rear Tires 110x100x18

Battery None

Spark Plug CR8E

Yamaha WR-F Specs

2003-2011 WR450F

Front Tires 80x100x21

Rear Tires 110x100x18

Battery YTZ7S

Spark Plug CR8E

Yamaha WR-F Specs

2012-2013 WR450F

Front Tires 80x100x21

Rear Tires 120x90x18

Battery YTZ7S

Spark Plug CR8E

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