Heya, This is my thread from a while back and should help you. I was stuck too but ended up being pretty easy. http://www.aus300zx.com/forum/showthread.php?t=291021&highlight=sprocket Good luck Ben
when u install it again, lube the sprocket with grease and the crankshaft. so it deosent fuse together. if using a puller, tap the head of the puller with a hammer