On a warrior:

Flipped the rears on my warrior and now its way less tippy. Would flip the fronts but when you flip the rears it sets you up perfectly to where in most situations it will have understeer before tipping (will still tip if you turn to hard but not so bad in a slide). Atleast with my tire setup. Definetly flip the rears, dont even have to do the valve stems, just air them up from the inside.

 

I second this

 

If you do this go ahead and order you some extra tie rods and ends, trust me. Also don't get them from Yamaha they are like 46 bucks for just one end.