sprocket change?

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The popular drive sprockets are .325 x 7, 8 or 9 which fit all .325 chains.

And for 3/8 its usually a 7 or 8 tooth sprocket, again for all .3/8 chains.

Trouble is when you try to mix a .325 chain with a 3/8 sprocket, or vice versa.
 

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