400>426>426 big bore

3 replies to this topic
  • Goonyz400f

Posted August 06, 2015 - 09:34 PM


If a 426 bore can fit on a 400 then can a 426 big bore fit a 400 aswell

  • hondarider1031

Posted August 20, 2015 - 09:45 AM


With a 426 rod, yes-provided the kit comes with a new cylinder
A bore In kit probably wouldn't work-the 400 cylinder walls are fairly thin

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • Goonyz400f

Posted August 25, 2015 - 02:22 AM


I was meaning the kits that come with the bore and piston

  • grayracer513

Posted August 25, 2015 - 06:15 AM


Most kits are 3mm overbores to 95mm, which makes it a 426.  You can also do the same thing by using a 426 piston and cylinder, rebuilding the crank with a 426 rod, or by using a 426 cylinder, and a piston from an '03-'09 450.  It's a lot of work for a 6.5% increase in displacement.

Related Content


Snake pit oct 30th by The Anvil

Dirt Bike   Dirt Bike Regional Discussion   California
  • Hot  57 replies

Michigan Motocross Tires by 288yz450

Dirt Bike   Dirt Bike Regional Discussion   North
  • 1 reply

First Hare scramble tips by dhend8

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  33 replies

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

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

YZ450F 03 Sparks driving me crazy by SirAttard

Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • 5 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.