best power gain for a 03 yz450f

6 replies to this topic
  • jturnbull329

Posted December 14, 2009 - 07:07 PM


I have a 2003 yz450f and i was wondering what my best bang for my buck would be for a performance gain. Right now its all stock except for hot cams

  • rjcook450

Posted December 14, 2009 - 07:15 PM


Aftermarket pipe, and rejet.

  • xr88honda

Posted December 14, 2009 - 07:19 PM


throw a big bore on the old girl

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

Posted December 14, 2009 - 08:44 PM


Port the head. Done by someone who knows what they are doing will benefit more than a pipe or big bore.

  • grayracer513

Posted December 14, 2009 - 08:57 PM


Port the head. Done by someone who knows what they are doing will benefit more than a pipe or big bore.

Careful. Done by someone who doesn't know what he's doing it can cost you more than just money.

  • FinchFan194

Posted December 14, 2009 - 09:14 PM


Is it down on power since you bought it? Maybe its times to split the cases for a new crank and then put a new piston in it.

  • jturnbull329

Posted December 15, 2009 - 03:28 AM


no its got a tonn of power, and i dont think ive lost any but i just want more power. I think im gonna put a new topend in it this winter and maybe port it

Related Content


yz250x vs 450 4t comparisons (preferably desert riding) needed by JakeNorthrupYZ450F

Dirt Bike   Make / Model Specific   Yamaha   Yamaha 2-Stroke
  • 9 replies

Is it worth it? (Cam and High compression piston) by macgi77

Dirt Bike   Make / Model Specific   Honda   CRF 150/230 F/L
  • Hot  36 replies

Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies

Should I buy this bike? help....... by Numsa Hul

Dirt Bike   General Dirt Bike Forums   What bike should I buy?
  • * * * * *
  • 10 replies

The "going back to the other darkside" adventure... by Monk

Dirt Bike   Make / Model Specific   KTM   250/350/450/505 SX-F & XC-F (4-Strokes)
  • Hot  113 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.