I’m actually going to have a full-on 3-angle valve job done on this head next week. More on 3-angle valve jobs later…
Regardless, I wanted to show the basics of lapping valves.
Figured it’d be good to show a general overview.
I made a quick video. I’m sick today… Hear me sniffling?
This ring below is the valve seat.
You can see below, the valve sits in the combustion chamber and needs to sit as closely / tightly as possible to the ring on the combustion chamber. Over time I guess the seat gets worn and can start leaking which causes lower compression and a weaker engine.
Another view below to see how the angle of the valve sits on the angle of the ring in the combustion chamber. This is really what is happening. You want the angle of the valve to perfectly match the angle of the ring in the combustion chamber.
This is the grinding material and lap tool.
See how the suction cup thing holds the valve.
2 responses to “Lapping Valves”
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Published - Jun 12, 2012
k&n filter bags
Someone is going to find this info useful.. I spent 4 hours today riding in shitty shitty rain, from State College (Penn State) coming back to Philly. Pretty much torrential down-poured the entire way. My 79 cb650 has velocity stacks on it which means I should not be able to ride in rain at all. […]
Ed, you can lap my valves anytime!
Thanks for the video, this makes it seem easier than I thought.