B&S engines are not tiller specific. Briggs dealers, repair shops are
everywhere. Your described problem is the recoil starter, This uses a flat coil
spring to rewind the starter cord. sometimes there is too much slack in the
spring, common when the starter cord is replaced. Putting more tension on the
spring before attaching the cord will solve that problem, Sometimes the ball
and slot mechanism ( pawl) will become too dirty for the balls to drop back
into their running slots. A couple of shots of WD 40 will usually cure that.