Differences between 03 & 04 yz450

2 replies to this topic
  • djo269

Posted September 15, 2005 - 01:15 AM


What things did Yamaha change from the 2003 yz450 to the 2004 yz450? How much of a weight difference is there between the two years and what did they change to lose the weight of the bike? Was there a power difference, did they give it more power in 04? thanks

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Matt96xr6

Posted September 15, 2005 - 06:42 AM


Biggest difference is the 46 mm 03 forks and then the 48mm single chamber 04 forks.

Weight about the same.
Power, they took some of the hit out of the bike.

Go to Yamaha-motor.com and do a Specification comparison on the 2 modoels.

  • grayracer513

Posted September 15, 2005 - 07:14 AM


The weight was close, but the '04 is lighter. Another nice little add-on was Ti footpegs. The forks were a significant improvement.

How they altered the power character is not clear to me. Their website said it had more rotating mass, but the crank and flywheel assemblies are the same, and the two bikes post nearly identical numbers on the dyno. It probably had something to do with ignition mapping. I know on my '03 the FMF exhaust with the PB header makes the power much smoother, even while it actually adds a bout one HP to the peak.

Given the choice between two bikes with similar time, equipment, and price, I would pick the '04 without hesitating.

Related Content


Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

Need help by Goforaride

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  68 replies

Thinking about Yamaha 250... by Arctic Pride

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies

100 hrs on 2014 yz450f, shim valves or replace them? by ttr230rider6

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  79 replies

Chubby dad, looking at bikes , First trip to the orange/black forum ! by Slow_ride

Dirt Bike   Make / Model Specific   KTM   250-530 EXC/MXC/SXC/XC-W/XCR-W (4-Strokes)
  • Hot  28 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.