Apparently your pulley has been changed. On a cub with a magneto there was only one mark, which was top dead center. On a pulley with 2 marks, the second is is top dead center, which is where the magneot impulse should trip. The first mark is 16 dgrees before TDC and is the mark you would use with a timing light when timing a distributor. If you hand crank your cub any, stick with the TDC setting, if you advance it there may be a problem with kickback, and that hurts.