To verify your timing. Find tdc with a piston stop. measure the circumference of the balancer. A narrow 6' tape measure or stagger tape works well. Divide the circumference by 360. Multiply the product times the number of degrees you want to time the engine to. Convert the decimal to a fraction . Now measure that amount from the tdc mark on the balancer with the same tape you used to measure circumference. I like to extend the mark down the front of the balancer across the elastomer on to the center hub. That way when checking timing I can see if the outer ring has slipped.