I am changing my timing chain, tensioner, guides and sprocket. the crankshaft mark on the new sprocket is 180 degrees from the keyway. The old sprocket mark is aprox 160 degrees from the keyway. What rule due I follow, Keep the shaft key marks at 12:00 or match the chain marks to the sproket mark which would put the crankshaft key mark 20 degrees to the left of 12:00?
 
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