WR250 WR450 Yamaha lowering link YamaLink suspension spring rate

Robert, a WRF Yamaha rider asked what spring rates he should consider with the new YamaLink suspension lowering kit. We replied....

If you have a WR450F the stock spring is a 5.3 kg/mm according to Race Tech,
and ideally a 5.6 + YamaLink is called for to ride at 100mm sag. I would
first try to REST your current spring to 94mm (as opposed to 100mm) and see
how you like it. Our instructions will guide you to turn the high speed
compression clockwise at least 1/4 to 1/2 turn for starters, and turn the
rebound in at least 3 clicks.

If you are on the 250F the stock spring is a 4.7 kg/mm, and ideally a 5.4 +
YamaLink is called for. All info above applies to the WR250F in terms of
setup.