You can't TIG weld the sprocket if there is the slightest trace of oil between it and the shaft, which is why most knowledgeable shops pin the sprocket. If you heat up the assembly enough, you can burn the oil off, but God only knows what that does to the rest of the shaft.
The LN ceramic hybrid bearing has no oil seal on the flywheel side, so that the oil mist inside the cases can lubricate it. Adding oil feed to the LN bearing is actually detrimental to its life expectancy.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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