I ordered a JT 15T sprocket for my 90 XR600R It is thinner than the OEM sprocket by about 1/8in. &%$#@!? Are the Sunstar better fit/quality or do I have to go with a Honda OEM sprocket? What about a case saver with the 15T sprocket? Not much room in there? What's everyone using? Thanks PS Will I be able to use the same chain length with 13/48 and 15/48?