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Big Jim

2008 yz450f pressure springs

2 posts in this topic

Does anyone know what the rating (kg) is for the stock pressure springs in the front fork of a 2008 yz 450f are?:thumbsup:

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If you mean the "ICS", or free piston spring in the damper cartridge chamber, I believe they are 2.0 kg/mm.

I switched mine for 1.3's, and my son's for 1.7's, along with drilling the free piston and changing over to 251.VM2.K5 Suspension fluid from Dave Johnson at Smart Performance. I weigh 185, and my son, who is somewhat faster, weighs 190. The results have been somewhat amazing.

My review:

http://www.thumpertalk.com/forum/showthread.php?t=640822

The free piston modification:

http://www.smartperformanceinc.com/YZMODASSEM.htm

...and one reason you might want to do it:

http://www.thumpertalk.com/forum/showthread.php?t=650136

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