Two different ways to go:
1) MCX weights stock spring w supplied shim, Stock Helix (39 degree) yamaha white secondary spiring (Stock on 2010-11 MTX's) wound to 70 degrees.
2) Yamaha 8BU weights loaded to 62-64 grams, Blue White Blue Primary, Yamaha White Secondery wound 70 Degrees, Yamaha 45 degree helix (shockwave set at 45-47 Degrees is polular as well).
In my experiance the MCX set up pulls harder in the low end but the 8BU's are more reponsive. Both set ups are great for belt life. Steeper than 47 degrees seems to create more belt heat and shorten life drastically. The Erlandson Arcitic Cat purple secondary spring is great as well and usully requires less torsion preload (40-50 degrees). Others may disagree but I have had great luck with both of these set ups.
LL
