making a 03 yz450f street legal


9 replies to this topic
  • yz450fbeast

Posted September 14, 2012 - 08:19 PM

#1

just got a 03 yz450f today and wanted to know what was needed to make it street legal

  • corndog

Posted September 15, 2012 - 10:33 AM

#2

WR flywheel & stator
Lighting kit
Left mirror
DOT tires
Speedo

I'm sure it varies a bit by state, but I think that's pretty much it...

  • rknaub

Posted September 15, 2012 - 08:35 PM

#3

A horn is required where I live.

  • grayracer513

Posted September 16, 2012 - 11:10 AM

#4

WR flywheel & stator


You cannot install the WR450 flywheel or stator on an '03-'05 YZ450 without changing the crankcases, crankshaft, and left crankcase cover.

  • corndog

Posted September 16, 2012 - 04:46 PM

#5

Woah, good to know, thanks for the correction! I guess they're only interchangeable between the YZ/WR 400 & 426?

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  • grayracer513

Posted September 17, 2012 - 06:31 AM

#6

Woah, good to know, thanks for the correction! I guess they're only interchangeable between the YZ/WR 400 & 426?


Yup. An '06-'09 YZ can be converted without changing the crankcases, but you still have to change at least the left side of the crank.

  • corndog

Posted September 17, 2012 - 10:23 AM

#7

Yup. An '06-'09 YZ can be converted without changing the crankcases, but you still have to change at least the left side of the crank.


Okay, so does this look right?

1998-2002 YZ/WR 400/426 - Stator/Flywheel are all interchangeable.
2003-2005 YZ 450 - Must change both [color=#282828]crankcases, crankshaft, and left crankcase cover, in order to install WR stator/flywheel.[/color]
[color=#282828][2006-2009 YZ 450 - Must change the left crank half (or entire crank) in order to install the WR stator/flywheel.[/color]

[color=#282828]Do you know if the 2010+ WR stator/flywheel work on the '06-'09?[/color]
[color=#282828]I'm looking at picking up a 2010+ YZ450 in the couple/few months, I don't imagine any WR parts fit that motor?[/color]

Edited by corndog, September 17, 2012 - 10:24 AM.


  • grayracer513

Posted September 17, 2012 - 11:03 AM

#8

The '06-'09 also requires the left crankcase cover from a '07-'11 WR. The starter motor hole will need to be plugged.

'10+ YZ450's produce 140 watts as it is, and they have a DC system, so they have no need for additional power.

  • corndog

Posted September 17, 2012 - 07:14 PM

#9

Great info, thank you sir!

  • EGPeil

Posted October 03, 2012 - 07:22 AM

#10

Find an e-Line stator for the 03-05 YZ450F and you don't need to change the crank or cases. e-Line doesn't make them any more so you have to watch eBay or post something here looking for one - that's how I found one.





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