Help with 2006 WR250F spring rate with YamaLink and 205 pound rider

Caller from California asking about spring rates, sag and maybe installing a YamaLink. Weight without gear is 205 pounds. Stock spring rate is 5.1kg. At the caller/rider's weight he needs a 5.5 kg BEFORE a YamaLink to achieve approximately 100mm sag. And with a YamaLink the rider needs a 6.0 kg spring for his 2006 WR250F lowering needs.