The only way to really check the timing of a twin cam/binary cam bow is to use a draw board. These are realtively simple to make/use. The draw board will allow you to check the timing at full draw. Once at full draw can look at the cams to see if they are in time(most have some kind of marking). If out of time, one cam will be different than the other, meaning one is rotating either faster/slower that the other one. To sync them up, you will either have to add a twist to the cam cable(to make the cam rotate faster or take a twist out to slow the cam down. Any good bow shop will have a draw board. If not, make one. Good luck! If a twin is out of time, you will NEVER get it to shoot correctly.
Kelly