In Section 11, Page 6 of the Kohler Service Manual, it states: "If a valve guide is worn beyond specifications, it will not guide the valve in a straight line. This may result in a burnt valve face or seat, loss of compression, and excessive oil consumption."
There is plenty of oil available to be sucked past worn guides because the crankcase breather also serves as the cover for the valve stem/springs. You must remove this cover in order to set the valve lash. During operation of the engine, the entire crankcase area is awash with an oil mist thanks to the dipper on the end of the connecting rod splashing the liquid oil.
The up and down movement of the piston creates positive and negative pressures inside the crankcase and the breather assembly addresses those pressures to neutralize them. A faulty breather will allow engine oil to drool out of the vent.
It does not take a lot of oil in the combustion chamber to create a bluish tinge in the exhaust gasses.
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