Join Date: Sep 2007
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All engines will lose a certain amount of oil pressure over time as normal wear increases engine bearing clearances. But unusually low oil pressure in an engine regardless of mileage is usually a sign that something is seriously wrong and requires immediate attention.
In a high mileage engine, low oil pressure is usually due to a combination of worn main and rod bearings and crankshaft journals.
As the bearings wear, clearances increase allowing increased flow which reduces pressure.
Another common cause of low oil pressure is wear or excessive clearances in the oil pump itself, could be debris that passes the oil screen, could be lots of things.
It's really freaking confusing and took me a long time to understand. Light comes on = seek immediate attention as your whole bike is at risk
Last edited by Z-man; 10-10-2007 at 12:43 AM.