The timing Sprocket should be replaced during the course of any engine rebuild.
This is a precision part, and by using this correct specification item, you know the quality is 100%!
We recommend when replacing this item, you should consider a new Cam-chain and Cam-Sprocket to make sure no damage occurs to the new parts, by interfacing with old and worn out items.
It is not recommended to interface old worn items with new on the Cam-chain tensioner assembly. Don't forget to order all the gaskets you will require when reassembling the engine!