What sprocket to get?

[cody89]

I have a YZ 125 engine that is somewhere in the 90's year. I haven't ID'd it yet but that is what I was told.

Does anyone know the pitch on the stock sprocket?

 

[OzFab]

More than likely, it's somewhere around 520. Measure the distance between the teeth & the thickness of the sprocket; that'll help determine the exact size

 

[cody89]

Its a 520. Thanks.