04 raptor 660 cant get iol back to the tank. It has a new pump, screens are clear and new ballcheck. im using the center case from an 01 and all my covers and parts from 04. theres oil getting to the top of the head but will not go to the tank. I have split the case a number of times going through this step by step from yamaha service manual and cant find anything done wrong. I did replace second gear but all is there.