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2009 Yamaha YZ450F/YZ250F First Look

Friday, June 6, 2008
J Law puts the 2009 Yamaha YZ250F thru its paces.
Supercross West Coast Lites champion Jason Lawrence puts the 2009 Yamaha YZ250F through its paces.
It's that time of year again. Even though 2008 is not yet half over, manufacturers are already rolling out 2009 motorcycle specs. Yamaha has jumped the gun on its Big Four competition by unveiling its 2009 YZ dirt bike lineup.


Of the two four-strokes, the smaller YZ250F has had the most work done for '09. The single-cylinder 4-stroke mill is unchanged - except for a black magnesium valve cover, but the little Yamaha thumper does source a new exhaust. A revised Titanium headpipe is 60mm longer and the muffler is shortened 50mm and lightened 180 grams (0.4 lbs). Combined with new ignition mapping, Yamaha promises the new exhaust improves low-end power and throttle response.

A new clutch basket assembly, utilizing rubber instead of coil spring dampers, is lighter and easier to maintain. And pulling in the clutch should be more convenient with a redesigned lever assembly, with the lever itself shorter and offering a greater range of adjustment.

The '09 250 also sees modifications to the rolling chassis. Up front a new Bridgestone M403A tire is connected to the KYB SSS (Speed Sensitive System) fork with revised settings and set in a new top triple clamp.

2009 Yamaha YZ450F
The YZ450F shares many of its little siblings changes, including a new swingarm, rear hub and top triple clamp.
Even more changes appear out back, with a ligher (350 grams, 0.77 lbs) hydroformed swingarm featuring reduced twist and vertical rigidity but increased horizontal rigidity. The swingarm is mated to a revised linkage and rear shock which now uses a steel spring instead of titanium. The shock settings, like the fork, are also modified. Also new is a lighter (265 grams, 0.58 lbs), more compact rear hub system with a larger diameter axle (25mm compared to 22mm).

Other '09 tweaks are shared throughout most of the YZ lineup. A more compact brake hose holder replaces a larger steel design up front, with a new D.I.D. gold-colored chain sprucing up the rear. Another minor difference is a new seat cover pattern, which Yamaha claims improves grip and is more stain resistant.


Changes to the 450 YZF are similar to the 250, with the following exceptions: No changes to the exhaust, tires or suspension units. Instead the big news is, drum roll, the number of stator mounting points have increased from three to four! Okay, nothing revolutionary there, but first and third gear shift fork bars are 4mm longer to improve shifts between second and third.

After that the revisions are essentially identical to the 250F, with a new swingarm and linkage, rear hub and top triple clamp. Also modified is the clutch lever assembly, front brake hose holder, gold chain and seat surface.

YZ250, YZ125 and YZ85
2009 Yamaha YZ125
The YZ 2-strokes haven't gone the way of the Dodo quite yet, with Yamaha still putting out the YZ250, 125 (above) and 85.

In 2005 the 2-stroke YZs made up 50% of Yamaha's dirt bike sales. Now the little smokers account for less than a quarter of the marque's off-road numbers. The evaporation of the 2-stroke market has contributed to Yamaha's recent drop in dirt bike sales, but unlike many of the other off-road manufacturers - some having dropped 2-strokes altogether - the Tuning Fork label remains on three YZ buzzers.

Little has changed to the YZ lineup, with the YZ85 just getting new graphics. The YZ125 and 250 received upgrades mirroring their 4-stroke counterparts: the new aluminum brake hose holder, D.I.D. gold chain and new seat cover pattern. Both bikes are now fitted with the same D742FA Dunlop front utilized on the YZ450F, with the 125 also getting a lighter (200 grams - 0.44 lbs) Dunlop D756G rear tire.
2009 Yamaha YZ450F/YZ250F Gallery
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jaay, -boring it out  January 27, 2011 04:40 AM
needs head bored out off my yz 125 2003... if i bore it out to a 144 will the bottom end hold ????
nyztrx450 -yz450  November 7, 2010 06:33 PM
m where u get a new se yz450 4 3899?
funnie55 -to all of the above comments  June 9, 2010 05:09 PM
re-read your posts...you people are retarded. if you really do ride, please stop. not kidding, please,please stop.
max -thats my bike man  March 10, 2010 02:32 PM
ilove yz 125 i wanta a bike with alot of balls
max -bite me  March 10, 2010 02:30 PM
mad bike man
tyquell coles - like your dirt bike  November 18, 2009 04:42 PM
i like your dirt bike are you silling your dirt bike because you have so good dirt bike
M -!!!!!!!!!!!  November 12, 2009 10:16 AM
Ordered a new '09 YZ450F SE today for $3,899! I can't wait for it to get delivered to the dealership next week!
jai dog -09 yzf 450  October 22, 2009 03:24 PM
spent 7000 grand on it strait after walking out of the shop shuould c it its MINT

Hi- Trick Tanks racing -Trick Tank  October 5, 2009 09:23 AM
Please check out the new air stands and Graffics we got lots of stands and graffics please check us out at tricktank.com thanks and have a great day
PR Racing -YZ250F 09 electric start  August 18, 2009 09:21 AM
what is involved? just order WR OEM stuff and all good??

Alyssa Nappa -dirt bikes  August 16, 2009 08:47 AM
if u have any kind of dirt bike and u r looking to get rid of it please email heeyalyssax3@yahoo.com tell me the price and well see from there thanx :)
Alyssa Nappa -i neeeeedddd thiiissss!!!! :)  August 16, 2009 06:23 AM
i am looking for a Yamaha YZ450F 2009 for the cheapest price you can give me i am willing to pay $600 if you can hook me up with a brand new or somewhat used Yamaha YZ450F 2009 for $600 please email me for sure at heeyalyssax3@yahoo.com thankyou!!!:)
2010 yz250f -BUY  August 14, 2009 02:55 PM
yea get the 2010 YZ250F AND YZ450F THERE CRAZY!
conor smith -ktm  June 26, 2009 01:20 AM
why dont u get a ktm
Garrett Faircloth -dirtbike  June 10, 2009 03:13 PM
yz250 this dirtbike is a sweet!
tiara -could u help me  May 11, 2009 07:55 AM
i need a dirt bike how much would u sell me one email me my adress is gtown_boy13@yahoo.com
jamie -YZ250F special edition motorbike  May 7, 2009 03:48 AM
how much would a YZ250F special edition motorbike cost
jamie -how much?  May 7, 2009 03:44 AM
hey how much about would a 250 brand new cost??
Tyler Ballerini -yf450f(beast)  March 11, 2009 09:33 AM
I ride the 09 yf450f and the thing is a beast...i race all up and down the eastcoast and i just straight up put kids in the berms i mean this bike is so sick!!!!!
david -Mx-crazy-07@hotmail.com  January 26, 2009 06:15 AM
i need me a dir t bik and it is my won dirt bik it is the best thing to have for me and i need it so bad and it is cool to have one and it can be my only dirt bike
brandon -could someone help me out  January 13, 2009 11:43 AM
i would replace all the head gaskets on the top end and see what that dose for you
hi -sweet  November 16, 2008 06:52 PM
sweet bikes
Jake Kelly -could someone help me out!!!!!!  November 6, 2008 04:14 PM
I have a 2004 yamaha yz 450f and it is leaking oil at the top of the head where the tube comes out for air and to leak oil but i have a skid plate on the bottom of my bike and every time i clean it its realy clean. But when i get done riding in the woods or on a track there is oil on my skid plate. And some times when i go to ride my bike back fires and it wont start and i have to clean the spark plug and i have to do it every 3-5 weeks. i would really apreciate it if you would help me out. You can reach me on myspace Mx_Crazy_07@hotmail.com please please comment me back because i dont want my bike to lock up before i start racing again.