more displacement for YZ400F


2 replies to this topic
  • gearhead2060

Posted January 29, 2006 - 08:40 PM

#1

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.

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  • rsstom

Posted January 30, 2006 - 05:57 AM

#2

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

#3

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: ....you 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:





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