2005 yzf450 head years

6 replies to this topic
  • Warzardo

Posted May 03, 2011 - 03:43 PM


hello, my head got messed up on my 05 yzf 450. i was wondering what all years use the same head as the 2005 yfz 450?

  • grayracer513

Posted May 03, 2011 - 05:30 PM


'03-'05 YZ40F, '03-'04 WR450F, '04 YZF450 (quad) will directly fit.

'05-'06 WR450F and '05-'08 YFZ450 (quad) will fit, but you'll need to block off the ports for the air injection system.

There are a couple of head ads in the classifieds as I write this.

Your head may be repairable. What happened to it?

  • Warzardo

Posted May 03, 2011 - 08:13 PM


the bolts holes are striped. and the intake cam melted the lobes.

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  • grayracer513

Posted May 03, 2011 - 08:32 PM


Engine Dynamics can probably repair that for around $300. Worth checking

  • Warzardo

Posted May 05, 2011 - 08:17 AM


i dont think i can repair this head little more dmg than i thought. it looks lke one of the intake valves broke off and put huge holes in piston and the bottom of head is all damaged. i cant even thee the spark plug anymore its now bound to the head. lol

  • Warzardo

Posted May 05, 2011 - 12:42 PM


so if i use a head from lets say a 08 yfz 450 does it use the same valves and cams?? as the 05 or do i get cams from a 08??


  • grayracer513

Posted May 05, 2011 - 12:57 PM


The valves are interchangeable.

The cams differ as follows:
'03-'05 5TA-12170-00-00 and 5TA-12180-00-00
'06 ---- 5TA-*-10-00
'07 ---- 5TA-*-20-00
'08-'09 2S2-*-00-00

All the cams will fit, but each newer set is biased more for top end and less for low/mid that the previous one. My favorite is the '06, but it depends what you want the bike to do.

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