Strange Mystery Goo in Oil Sight Glass

[BastrdHK]

100C as in centigrade, water boiling point, not 100 miles.  In cold, particularly damp, even with the oil cooler covered my bike often will not see much over 60^oC.  The only time I worry about "goo on oil sight glass" is when I can't see the oil level.

Thanks for making sure, but the number 100 in my post was intended, but purely coincidental.  I was aware he meant temp in degrees Celsius.  I was responding to he "good long ride" portion of his post.  Again, distance was not a factor in eliminating the condensation in the sight glass for me.

Koko makes a logical point.  I have always had the crank case breather stock and it makes sense that the vapor could be more likely to stay in the stock setup.  Isn't there a one way valve there?  So that when pressure in the crank case builds to a point the valve opens and releases said pressure.

I have just switched the stock piping for a crankcase breather filter, and will see what the results are over the winter riding.

[koko64]

There is a drain back hole in the breather for oil and I suppose unevaporated moisture could drain back also. When warming up the bike I have seen steam coming out off the breather. I would keep the breather box as it does separate the oil from the steam and air vapor.
On the dyno, the EGA indicated a richer mixture with the breather hose connected to the airbox. Evidence of intake contamination. I also saw no horsepower increase with the breather connected to the airbox to remove pumping losses. Higher revving race bikes gain horsepower from using the intake vacuum to scavenge crankcase pressure, but the lower revving street twins like my ancient 900 have it for emissions compliance.

You should see all the links and threads on this stuff!