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.
Thursday, March 3, 2011
Tuesday, February 22, 2011
2008 Yamaha WR250F lowering link suspension spring rate
A 2008 WR250F rider asked about rear suspension spring rates and lowering their Yamaha WRF. The weight was listed as 65kg.....
"With the 2007-2011 WRF Yamaha lowering link's extra 10% leverage, the bike and rider will achieve much better plushness, traction and soak up the square edge and braking. To achieve this the sag must be rest and the bike properly sprung. The stock 2008 WR250F spring rate is 4.7kg/mm.
At 65kg with the stock setup you need a 4.93kg/mm or closest.
Then we add 10% to the 65kg weight and input approximately a 72kg rider weight and get 5.09 or closest....and closest is 5.2 kg/mm which is great if the rider carries a pack or tools or water. And it allows them a bit of range on the sag setting."
"With the 2007-2011 WRF Yamaha lowering link's extra 10% leverage, the bike and rider will achieve much better plushness, traction and soak up the square edge and braking. To achieve this the sag must be rest and the bike properly sprung. The stock 2008 WR250F spring rate is 4.7kg/mm.
At 65kg with the stock setup you need a 4.93kg/mm or closest.
Then we add 10% to the 65kg weight and input approximately a 72kg rider weight and get 5.09 or closest....and closest is 5.2 kg/mm which is great if the rider carries a pack or tools or water. And it allows them a bit of range on the sag setting."
Friday, February 11, 2011
Thursday, February 10, 2011
Greasing the Yamaha suspension linkage
A few emails this week asking the same question about the amount of grease in each Yamaha suspension lowering link.
Answer: we pack about 2 years worth of moly greast INTO each bearing before shipping. We tested the snot out of one and tore it apart 2 years later. Perfect!
Answer: we pack about 2 years worth of moly greast INTO each bearing before shipping. We tested the snot out of one and tore it apart 2 years later. Perfect!
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