I have a 2007 WR450f and would like to know what a good spring rate would be for my weight being 73kg. Also can I raise my fork tubes? I am 169cm tall and would really like to get my feet down for single track.
Cheers,
Our response...
Hi. 73kg is about 160 pounds and that is fine with the stock spring. The install instructions will tell you to RESET sag as being the #1 most important aspect. Light or slow riders reset sag to 100mm which is where a completely stock Yamaha WRF rear sag is set (give or take a few mm).
More aggressive riders can set rear sag to about 94mm.
Here is a good picture tutorial on setting sag: http://www.tootechracing.com/suspension_tips.htm
Then you have options to dial in the high speed compression (the big knob atop the rear shock, not the flat blade).
The install instructions will also tell you to slide the fork tubes UP at least 4mm and then fine tune based on personal preference.
More FAQ can be found on our page at http://www.motorcycleloweringlinks.com/index.php?content=wr_lowering_yz_lowering_faqs
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