One thing to always remember:
Never
EVER,EVER run any engine fast when it is first started.
Oil needs to be circulating freely or y'all don gonna cause premature wear.
---Just the nature of things mechanical.
It matters not, if the engine is pressure lubricated or splash system.
An engine when first started, as stated, needs a richer mixture till the combustion chamber warms, then the mixture can be leaned by
opening the choke appropriately, then fully opening, it usually only takes a minute or two.
Newer fool injection engines do this without having a choke as they have a fuel enrichment program in the engine management module.
An older engine with adjustable jetting, if set lean, will need more choke than one set richer.
Atmospheric conditions like air temp, humidity and barometric pressure also cause variations in the amount of choke needed in carbureted engines.
One just learns to "listen" to the engine, applying the necessary choke as needed, during that first couple of minutes of operation.
it ain't rocket science.
If a carbureted engine is warm to the touch, it needs no choking.
