04 YZ450F cylinder head

4 replies to this topic
  • compmoto

Posted June 21, 2011 - 06:48 PM


any suggestions on a source for a complete head , besides OEM ? Seems like $800+ is my only option , at the moment ... thanx for your insight

  • danzick

Posted June 21, 2011 - 07:08 PM


get it ported and polished. dont know if you'll find a complete head for under that? ive herd people getting awesome gains from porting and polishing. i did my own port and polish job. i pry ruined it tho. didnt know what i was doing. seems to run a little better tho. but if you get it professionally done, it will haul ass

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

Posted June 21, 2011 - 07:34 PM


You could always get the GYTR ported head assembly. It's ready to bolt on for a low price of $1400, LOL! What's wrong with yours? It's likely it can be repaired.

  • grayracer513

Posted June 22, 2011 - 06:55 AM


Look for used heads on eBay or CL. '03-'05 YZ450, '03-'06 WR450, and the YFZ Quad up to '08 will fit.

If you ruined the cam bores or even dropped a valve, there's still a chance yours can be repaired economically. Contact Engine Dynamics.

  • compmoto

Posted June 22, 2011 - 07:16 AM


thank u for the replies. I don't yet know the condition, as it is a pending purchase. I doubt I would go the GYTR route, and would be willing to repair it, if possible. I'm just looking at "worst-case-scenario" , 'cuz its been into before, and the kid doesn't know much about it. Plus, he was a "trail rider", not a racer, who may have kept up with maintenance/valve adjustments...I'm gonna offer him $700., and if he takes it, I'll open it up, and see what I'm in for ! I also proly wouldn't go the used route on Ebay, cuz u just never know what you're getting ...I'll already have a used head anyway. Maybe new valves,and gaskets ? That'd be too EZ for me ! Thanx again ! I should stick w 2 strokes !

Related Content


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

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies

05 yz450f not fast enough by RedeyeYZ

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  38 replies

Yamaha YZ450F 2017 by Chris.GVS

Yamaha YZ450F 2017
  • * * * * *
  • 1 review
  • Last review by Tommyk_55
  • On January 15, 2017

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

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.