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How to remove carbon from valves?


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A kitchen knife would work OK, if you can sneak one out of the kitchen.  To resurface the valve you grind a new surface into it at the correct angle, usually 45 deg.   There are many Heath Robinson ways of doing it, if you don't have the correct machine.   Don't forget to lap the new surface into the valve seat with grinding paste, for an air-tight seal.

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