when I bought my 95 dr 650 the first thing I did was replace my 16 tooth front sprocket to 15 and the rear from a 41 to a 46 and went to 520 chain. I still wasn't happy so I ordered a 14 tooth from sprocket specialists. The 14 tooth that fits a 520 chain comes with a round shim and a clip that holds it on the shaft instead of the factory one with three tapped holes that bolt the retainer plate to the sprocket. I installed it sprocket first then shim then clip and rode it with cover off for ten miles on and off road and it seems to work. Has anyone else tried or heard of this? Will it last?