I've seen these front chain sliders on rocky mountain and on ebay. I'm unsure where they go on the quad. I'm gonna have to replace mine soon and also wondered if this was a good idea.
http://cgi.ebay.com/ebaymotors/Yamaha-banshee-blaster-warrior-front-chain-slide_W0QQitemZ150103238339QQcategoryZ4397 2QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/Yamaha-banshee-blaster-warrior-front-chain-slide_W0QQitemZ150103238339QQcategoryZ4397 2QQrdZ1QQcmdZViewItem