Anyone now where I could find a 70 tooth rear sproket for a ttr 125

 

Have you tried searching any online stores lately? If not yet, do try to check out ebay, sprocketspecialists, motosport.com, 4wheelonline, etc. But when it comes to motorcycle parts and accessories, I always check first at 4wheelonline, they offer a wide range of parts. Oh by the way the part number for this is SKU#368 Geared to win do have this model and also Vortex Sprockets. Hope it helps.