Reply To: Thor and Sea King poppet valves

[Buccaneer]

The ones I’ve seen have a tiny hole drilled into the valve seat, and
the crankcase vacuum overcomes the spring tension, sucking
the valve open, and hence fuel into the crankcase.
That valve on the outside may just be the fuel shut off, as I believe
the hole in the seat determines the amount of fuel, and rpm
increase in the motor is by advancing the timing…… at least
that’s how I believe my little Thor is set up, but I’m sure
the bigger motors with poppet valves are a little more sophisticated.

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