Flywheel question

3 replies to this topic
  • intensem1rider

Posted January 18, 2009 - 07:49 PM


What is the difference between the flywheel on the 03-05 450's, vs the newer bikes 06-09? They have different part numbers. I am looking for a heaver flywheel for my 250f, and if the newer 450 flywheels are heaver than the 03-05 450 flywheels then I can get them cheap. Otherwise I have to fork out $100 for a GYTR flywheel :thumbsup:

  • intensem1rider

Posted January 18, 2009 - 08:14 PM


Well, by searching around on the GYTR site, I determined there is no weight difference at all period between the 250F and 450F flywheels...there all the same part numbers too! Exact same flywheels, so I bought a off road GYTR flywheel on e-bay for $55:banana:

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • grayracer513

Posted January 18, 2009 - 08:15 PM


The newer 450's use an "inside-out" flywheel form factor, like the WR's. NONE of the 450 flywheels will fit any YZ250F.

  • DPW

Posted January 19, 2009 - 03:33 AM


the 250F and 450F flywheels...there all the same part numbers too!

hmmm....not exactly....

GYTR® Off-Road Flywheel

Fits '06~'09 YZ450F
Adds 9.21 oz. for an inertia mass of 6.15 kg-cm² (stock inertia mass=3.8 kg-cm²)

Fits '06~'09 YZ250F
Adds 2.08 oz. for an inertia mass of 4.5 kg-cm² (stock inertia mass=3.8 kg-cm²)

Related Content


James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 replies
WR Camshaft Swap Info - last post by jamesm113

WR Camshaft Swap Info

  • 0 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

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.