3 questions


Anti stab kit prevents the front of the rails from jabbing through the track from skid modifications. The pro action was used on all Yamaha's from 97 till 2004. It gets a bad rap but if you put a little work into them and the right shock package and they ride just fine. But that will be a matter of opinion I'm sure, as they did have their problems.
 
Is the anti-stab for racing purposes or have any other benefits for stock sleds? Also, what does it look like?
 
the anti stab is small wheels at the suspension rail tips. they are not just for racing. they simply prevent you from ruining a track. usually not an issue on a stock sled but when doing suspension swaps or relocates, and driver changes is when the become important.
 
Anti-stabs also work great when you intend on running your track loose such as in mountain (deep powder) applications. You can get a wave in the track that can wrap around and get inbetween the drivers and the front edge of the rails. When you put the rails through the windows of the track at high track speed, it's not fun!
 
http://www.snowgoer.com/snowmobilin...ravel-revolution-continues/1215/#.UZO3GVrD9Ms
Yamaha Sets The Standard

Yamaha enters the long-travel wars with its Vmax 500 XT and 600 XT, calling the rear suspension design “Pro-Action Plus.” Vertical travel of the slide rails of the all new design is 10 inches and compression at the front shock occurs at a falling rate while at the rear arm, the rate rises.

The original Pro-Action came out in the 1983 Vmax :)
 
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