400ex up Sand Mtn (south face) at Little Sahara Utah

Hey there friends. Recently, on a ride at Little Sahara with my brother in law, he let me ride his 400ex up Sand Mtn. Interestingly, he was not able to make it up himself, weighing probably 50 lbs more than I. But only weighing 160lbs, I was able to make it up. I started in 3rd gear, then hit second - which held for quite a ways - then finished it in first. I'm impressed with this bike and even though I love my Blaster I'm probably going to pick up a 400ex or 400x in the near future. This bike has an exhaust, K&N, open air box, ITP Sand Stars on Douglas black labels, and it's jetted rich for this elevation. He just moved up here from the Phoenix area. Here's a video of the climb: https://www.youtube.com/watch?v=2spXqo1YjU0