Will a YZ426F head and piston fit on a YZ400F


4 replies to this topic
  • maltisecross

Posted September 18, 2008 - 07:45 PM

#1

I love my bike but I am looking to upgrade my motor a bit. I was just wondering if I get a 426 head and piston, would it just bolt on to a 400? Any input on this would be great.:excuseme:

  • 1rkcooper

Posted September 18, 2008 - 08:23 PM

#2

I believe it will bolt together.
This should answer your questions.
http://www.powroll.c...A_YZFWR426F.htm

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • kylwk1500

Posted September 19, 2008 - 08:09 AM

#3

you should be good to go. As long as you are doing the complete top end. The bottom end should be virtually the same besides possible gearing differences.

  • grayracer513

Posted September 19, 2008 - 08:27 AM

#4

you should be good to go. As long as you are doing the complete top end. The bottom end should be virtually the same besides possible gearing differences.

Not so. Review the info at the posted link, and you will see that using the 426 cylinder requires a 426 piston (obviously), and that that in turn requires the use of a 426 rod, because the 426 wrist pin is bigger.

The crank has to be rebuilt with a 426 rod and big end in order for that to work.

  • Birdy426

Posted September 20, 2008 - 12:16 PM

#5

You also will not see a big performance increase from a head swap. The 400 and 426 heads are virtually identical wiht the exception of the vacuum nipple for the octapus hot start on the 400s. The 426's had the 2nd gen FCR that has hot start internally.





Related Content

Forums
Photo

Snake pit oct 30th by The Anvil


Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  293 replies
Forums
Photo
Motocross

Thinking about Yamaha 250... by Arctic Pride


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  491 replies
Forums
Photo

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
Forums
Photo

James Stewart back on a YZ450F by YamaLink


Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 replies
Reviews

Yamaha YZ450F 2017 by Chris.GVS


Yamaha YZ450F 2017
  • - - - - -
  • 0 reviews
 
x

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.