05 wr450 sprocket help.

I wanted to change my countershaft sprocket. I have tons of sprockets for a YZ, however the WR sprocket has rubber on both sides. Anyone know why this is? Do I have to replace it with the same style or can I run my YZ sprockets?



I just run the YZ sprockets all metal. :cry:

I put a 15t WR cs on my 03. Even with the rubber it was cheaper than aftermarket, same price as a YZ cs. The rubber is there to help reduce chain noise....

thanks for the help.

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