I ordered some Renthal sprockets from LocoMX, I have an 08 YZ450F and they sent me 99-07 countershaft and rear sprockets. The rear fits fine, but the countershaft looks different than the stocker and when you tighten it, it becomes almost impossible to rotate. Is the spocket just the wrong design? The stock one has a flat side, and a outward groove. The renthal has semi wide grooves on each side.