more displacement for YZ400F

2 replies to this topic
  • gearhead2060

Posted January 29, 2006 - 08:40 PM


I recently had a rod seize to the crank on my 99 YZ400. I have been looking for stroker kits for my bike but have been unsuccessful. A friend told me that a jug from a YZ426 will bolt up with no problems. I would like to get as much displacement as I can while I am torn down. If any one knows more info about stroker kits or big bore kits I would greatly appreciate it.

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

Posted January 30, 2006 - 05:57 AM


Since you have to replace the rod anyway, use the 426 rod. The wrist pin was larger than the one in the 400. Then you can use a 426 cylinder and piston. Now it's a 426.
Or use the 400 rod and get an oversize Wiseco and have your cylinder bored and replated. Then it will be a 420.

  • jrcgaf364

Posted January 30, 2006 - 07:05 PM


I did the 426 mod to my 400... Thats all the bigger i would go . unless you can use all of the power the bike has to offer what more do you need. I was perfectly happy with the 426 mod :thumbsup: also can still use oem parts. i dont know about you but that means more to me than a few extra cc's. personally i dont trust a lot of aftermarket internals. :bonk:

Related Content


Yamaha YZ450F 2017 by Chris.GVS

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


Dirt Bike   Make / Model Specific   Yamaha   YZ 400/426/450
  • Hot  30 replies

2016 YZ450 by CaptainKnobby

Dirt Bike   Dirt Bike Technical Forums   Suspension
  • Hot  59 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

James Stewart back on a YZ450F by YamaLink

Dirt Bike   Special Interest Forums   Pro Racing
  • Hot  47 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.