I WANT TO UPGRADE MY 00 WR400 THAT I JUST GOT



3 replies to this topic
  • roy_skinner

Posted June 06, 2002 - 08:37 AM

#1

CAN ANYONE GIVE ME SOME TIPS ON WHAT I CAN DO TO UPGRADE THE PERFORMANCE OF MY BIKE

[ June 06, 2002: Message edited by: roy skinner ]

  • YAMAKAZE

Posted June 06, 2002 - 09:29 PM

#2

Put a 420 Kit in it...

Bonzai :)

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  • Dan_from_HB

Posted June 06, 2002 - 02:18 PM

#3

Seriously, folks.....
Search on this page for messages with the following words:
Jetting
Air Box
Throttle Stop
Silencer
YZ Timing or Cam Timing
Grey Wire
Assuming your bike is bone stock, this should get you started.
Yamakaze, the only problem I have with the 420 kit is that Ty Davis blew up more 420 kits on his 400 engines than I can count, trying to get more power (same with 450 kits on the 426 engines). Granted, he was probably doing other mods as well, but these bikes are wound pretty tight as it is. Do you have experience with this?
Dan

  • MX_Tuner

Posted June 07, 2002 - 01:16 AM

#4

The overbore kits are very reliable for mere mortals. Ty's motors have a spacer plate under the cylinder. That means he has a heck of a lot more done to his motors than just a 2mm overbore. I've done a few 420 kits and every one has been stone reliable. My 450 hasn't been apart yet, either.




 
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