Originally Posted by FishinFather
What caused that? Poor install? It looks worn / burned / melted?
Is that the likely cause of a specific instance of "sumping"?
Poor install from factory, I cant even remember how many times since 2001 I've seen this. The worn look is the yellow coating over the ring runned off it's normal, the big chunk missing is where it was dislodged and rolled into the port from the oil pump pick up port during installation.
This will cause many different conditions.
In this instance oil level fluctuations on the stick, normal to low, to over filled, to corrected, to low, lead to inspections. More than 6ozs of oil out of the CKP hole bottom of the case, on Milwaukee 8s is considered need for inspection.
No engine braking or loss of power was reported, however these complaints tend to come from riders who are advanced riders, and larger displacement engines.
A causal rider may not realize its happening, further more, lower RPM operation would limit the ability of the pump to cause conditions that would promote sumping..
Fact. They Milwaukee 8 pumps move 6 gallons of oil per minute...