What size is the OE chain on a stock Blaster? Mine is a 2000 and I'm looking to replace the chain. When I took it off to service the rear axle we took the chain off and found that most of the O-rings on the chain were cracked and falling apart. I saw on eBay the chain listed as a 520-92 but I hate to rely on eBay for any kind of advice. Also, what kind of brand-name chain would you recommend? I've seen Renthal and Primary-Drive chains for about $40 but wasn't sure how they would stack up to the stock chain (Yamaha wants $75 for a new chain). I'm not looking to upgrade any if at all from stock as it's going to stay stock until I sell it. Thanks!