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Old 21st April 2020
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I'm glad the problem went away.
But I'm still betting that the hose was kinked originally.
And/or maybe breathers.

I checked the Timken site.
Both their single and double lip seals have a max pressure rating of 4.267 psi.
Pressure can either pull or push depending on it's source.
Their should be a slight predominant vacuum in the crankcase unless the breathers aren't working right.
And even then, that much vacuum to make over 4 psi is very excessive.

The flywheel and clutch however, especially at high revs, has the capability of making a lot of positive (pushing) pressure that is usually vented from the tranny vent hose.
If the carb were to leak into the CC and mix with the engine oil,
then the pressure builds in the primary due to the kinked hose,
The primary could open the seal, and vent into the crankcase.
The crankcase is always pulsating positive and negative pressure.
So while the primary opens the seal, the CC is pulsating oil/gas/mist into the primary.

There is an internal spring on the seal to hold it against the shaft.
If the spring fails, it's failed for good until it's replaced.
However, higher pressure than designed for can skeet oil past the seal.
And when that pressure subsides, the spring lays back down.
The seal still works as long as the nitrile rubber hasn't been compromised in the process.

How's that for some high class BS.
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