First apply some of the lapping compound to the valve face area with your finger. It only requires a small amount of compound. Gently place your valve into the engine. Use the Lapping stick by pushing the suction cup into the top of the valve and rotate it back and forth in between your hands. After about 10 seconds remove the valve and wipe the lapping compound off of both the valve and the valve seat. Inspect and make sure the contact area is uniform and about in the middle of the valve face. Repeat this process with the other valve and seat.
The valve seat cutters require perfect valve guides to cut accurately. Measure your valve guides and compare them to your engine’s specifications to make sure they are centered and not overly worn. If they are worn, you can either replace them or use a special cutter pilot before continuing.
D-42 - Engine Wiring Diagram Specialist
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