or Partial fail ?Anyone?....Still have pressure (light not on) but sounds like it is not getting enough oil to the top end, and around the cams.

 

......crickets.....





(BTW, not me)

 

Get a gauge like this one and thread it in place of the sending unit for the dummy light, that will tell you for sure if you do have an oil pressure problem.
http://www.marshallinstruments.com/products/MS00030.cfm

 

mine failed a year or so ago - you'll know it if it does

 

if the light is off then pressure is good, if your concerned why not flush it with some motor flush and do an oil & filter change just to be safe?

 

Why do you think oil is not getting around? Simply take off the filler cap while the engine is running and you should see if oil is returning, hence circulating. In 50 years of riding and driving I have never had an oil pump fail. If you are suffering strange noises then find out exactly where it is coming from. If in doubt visit a Harley dealer or indy for a second opinion. Unfortunately we can't see and hear over the internet!

 

After 100,000 miles I did a rebuild of the engine, after that I had what seemed to be low circulation, heads had lots of valve clatter etc.
I checked the spring & ball, I checked the internet for how much oil should get to the heads with no luck so I bought a new pump and wallah all the issues disappeared so,

Yes there are times when even-though the system is working its not strong enough to push oil as required, if you suspect, change it, its cheaper than being wrong, worse come to worse you have a backup.

The oil gauge idea is ok but you shouldn't need one.

 

The OP never mentioned if he had done any idle adjustment, or if he idle speed had been reduced. That alone could make the oil light come on. He also could have too much runnout:Crankshaft Runout
A serious problem with the Twin Cam engine is excessive crankshaft runout, which is a result of the flywheels shifting on the crankpin. Under harsh acceleration, deceleration or burnouts, the Twin Cam's pressed-together crankshaft can shift out of true by as much as .030 inch or even more. For comparison, a well-built Twin Cam crank will exhibit .001 inch or less of runout, although factory tolerances are often .004 inch and sometimes more. When a crank drastically shifts out of true, the pinion shaft (right side) wobbles severely, usually causing catastrophic damage to the oil pump, cam support plate and other related parts. Additionally, oil pressure and scavenging decrease, allowing excess oil to fill the crankcase and gearcase areas. Once the excess oil builds up to a certain level, it is usually blown out the cylinder head breathers and into the air cleaner assembly. Warning signs of a shifted crank include loud noises from the gearcase area, noisy lifters and significant amounts of oil being tossed out the breather hoses. Typically, the crankshaft, oil pump, camshafts, cam support plate and cam drive mechanism require replacement when a crank shifts significantly out of true. Refer to our May installment for additional information about shifted cranks.

 

And you're certain the light is working. Comes on at ignition and turns off with pressure?