1 reply to this topic
  • Joshklly93

Posted July 09, 2014 - 10:14 AM


Hi guys. having a small problem with my yzf 426. bought it the other day. had some one look at it today to be told its not a yzf but a wr thats been made to look like one as it had 5 gears unfortunately it was a stolen and recovered bike so a lot of the vin numbers have been scratched out. 
would any body be able to tell me if theres any truth in the yzf & wr thing as i have been told yamaha experimented with a 5 shift gear box on the 2003 yzf426 
If you could email me direct or on here it would be brilliant

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  • grayracer513

Posted July 09, 2014 - 03:24 PM


First off, there was no '03 YZ426F.  The YZ426F was made from '00-'02.  (there never was ANY yzf426)  The WR426F was built only in '01-'02, the '00 model WR was a 400.  All YZF/WRF models up to '03 were 5 speeds, as were all later WR's.  The '03-'05 YZ450F was the 4 speed.


At the front of the cylinder, near the bottom right "corner", the engine displacement is cast into the barrel.  It will either be 399cc or 426cc.


The CDI unit of a YZ426 has a total of 12 wire leads in two 6-pin connectors, plus one additional ground on its own connector.  The WR CDI has one 6-pin connector with 6 leads in it, another one with 5, and two more 2-pin connectors with two leads apiece.


You might also look under the seat.  A YZ426 will have an air box without a cover on top.  The WR has a cover with two narrow snorkels coming off covering the filter.  You may also find a model ID sticker on the rear sub frame under the seat.

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