Valve Seat B&S 12.5hp

stoutgoose

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Sep 17, 2021
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I have a B&S 12.hp single in a Westwood tractor mower that has popped the inlet valve seat.

I tapped the seat back into the head and have lapped the valve in, however I can still see a small halo of light shining from between the seat and valve when a torch is shone into the inlet port behind the valve and I suspect the seat is warped.

I have bought a new valve seat and valve, however the new seat has only a light chamfer on the sealing edge where the valve would seat rather than the larger sealing surface that the current one has. Does the new seat need to be ground, and if so, how can this be done?
 
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