What is purpose of valve lapping?
Valve lapping is a process of smoothing out the valve face and valve seat at the same time. The machinist applies a fine abrasive compound to the face of the valve and the seat and assembles the valve in the cylinder head. Then the machinist spins the valve while pulling it against the seat.
Are lap valves good?
Lapping works good, just more work, and prolly unnecessary if the valves aren’t leaking already. If the valves are leaking, it’s usually due to mis-alignment caused by worn guides.
What is valve lapping and why is it done?
The process of sanding the surfaces of valves and their heads where they come in contact with an internal combustion engine is known as valve lapping. If there is a malfunction or damage to the valves or valve seats, this procedure should be performed to ensure proper operation.
Is motorcycle valve lapping a true valve job?
So here is my big upfront spoiler alert about motorcycle valve lapping – a true valve job including cutting valve seats, etc. is and should always be the work of a professional motorcycle shop. Why? Because valve seat cutting is a very precise procedure requiring specialized equipment.
What is the difference between valve lapping and valve cutting and grinding?
A lighter touch is better. To oversimplify things, valve cutting and grinding is the part of the process done to make sure that the valve and valve seat create an air and liquid tight fit. Valve lapping is the final step in the process (sort of the icing on the cake) to make sure things are perfectly mated.
How do you lap a valve properly?
Proper lapping is done by spinning the tool between your hands (going in both directions and lifting frequently) like someone trying to light a fire using two sticks. Do not and I repeat DO NOT place your valve in a power drill and try lapping that way.