After cracking the head tube on my Yeti, I've got a stop gap solution until I find another nice bike. The yeti was all old spec. 26", straight head tube, Standard QR, screw in BB.
Bought a cheap dually (Scott Aspect) and switched all my decent running gear onto it. Reckon I dropped near 3kg off it. Mostly by upgrading the Dart forks to Reba and switching the cheap and heavy wheels and tyres to some decent TWE wheels and lightweight cross mark tyres.