Valve Lapping

[dvx304racer]

What is the easiest way to lap new valves and how do i know when to stop or shall I say when their good???

[440exnacsracer]

get some lapping compound from the parts store. mark the valve and valve seat at 3-4 locations around the radius with a permanent marker. just put a dab of compound on the valve. i normally place some fuel hose on top of the valve stem to rotate the valve. just work it in for a little bit and see where the seat is and that you have an even worn spot on the valve and seat.

[dvx304racer]

ok thanks

[wilkin250r]

When you're all done, assemble the valve, guide, springs, and the rest. Fill the intake port with denatured alcohol and let it sit for a couple minutes. If it leaks through, the valve isn't seating correctly and you've got more lapping to do. Same with the exhaust valves.