If the engine is as pictured then I believe these do not have a crank case sensor: ~ I have the same model and its free from this complication, It may also be worth checking that the auxiliary air valve is functioning properly i.e. open when the engine is cold & on gradual warm up the valve begins to close – luckily these engines are uncomplicated as previously stated so a methodical approach should get you back to heaven!
Bob.
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