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.
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Published - Jul 15, 2015
Such a great time! Bummer if you missed it. Everyone ripped around on dirt bikes all weekend. It’s cool to see people of all ages, guys and girls, riding 50cc z50’s to rare Penton dirtbikes. You basically need a pit bike to get around the place. Some weekend highlights: – There’s basically no rules. – […]