Marc's WR250F WR450F spring rate and sag for lowering YamaLink

Yamaha WR UK rider Marc writes "I weigh 13 st 6 lb hope to be able to set up suspension to suit."

After Googling the conversion from stone to pounds we replied.....

I believe 13 stone 6 lb is about 187 pounds in the US measurement. With the stock setup you are fine at 187 pounds and should be able to set your suspension up with 100mm sag.

With the WR250 and WR450 YamaLink and its extra leverage we take your 187 pounds and ADD 10% which is 18.7 pounds. Total weight you should spring your bike for is 187 + 18.7 for approximately 206 pounds.

To get perfect balance and handling I recommend going UP in spring rate for the rear to a 5.6 kg/mm spring to achieve the great handling and not have excess bottoming and understeer.
You can try to reset your sag with the stock spring and the YamaLink but I
bet you'll have a difficult time getting anywhere near 94mm to 100mm.