yamaha 450 head swap
Posted March 28, 2011 - 01:03 PM
Posted March 28, 2011 - 01:12 PM
Posted March 28, 2011 - 01:19 PM
Posted March 28, 2011 - 01:32 PM
Posted March 28, 2011 - 02:55 PM
Except for the AIS, heads from an '03-'05 YZ450, '03-'06 WR450, or '04-'08 YFZ450 Quad will fit.
Does anyone have experience with interchangeability of 450 heads? i want to see what years and models i can search for the head swap. i have a 2005 wr450, could i use any 450 head? 2003 -2009 yz/wr/yfz block? i don't use the AIS system...and i will swap everything (valves, cams, etc) over. i tried to look up p/n unsuccessfully...
The intake cams are the same on the earlier WR450's but the exhaust cams are different from YZ450 cams in all years, and therein lies the difference.
I was woundering what the differece was between the wr and yz. is just cam timing or what. i looked up part #s on cams and they r the same as r the pistons. I know the wr has a six speed and a heavier flywheel. But what else is different.
when u say ais system. what is that.
When you type "u", what is that?
Posted March 28, 2011 - 06:35 PM
Posted March 29, 2011 - 04:45 AM
Posted November 30, 2012 - 11:05 PM
I have wr450 2003, and definitely need a new head.
Does the head from 2005 will fit on 2003 WR450?
Can i use my cams from 2003 to a new 2005 head?
Does the top end gasket are the same, or will need 2005 gaskets?
Please advice. Thanks.
Posted December 01, 2012 - 07:35 AM
Posted December 01, 2012 - 09:11 AM
I think the only deference is AIS system vacum port and lowered compression ratio.
Please someone to confirm.