Hi Everyone,
I bought a 01 Sportsman 500 from a customer of mine, he ran it out of oil. When I got it I opened it up and found the piston pin was seized and the rod had some play up and down. Put a different crank, piston and cylinder in it. Got it back together and it ran pretty good. It had a problem starting intermittently so I put a cam in it. Didn't look that bad when I had it opened, lesson learned. Anyway I got it together and checked the oil pressure first time sticking a guage on it, the pressure reads about 10 psi at 3k rpms. Tore it all back apart and cannot find the reason the pressure is low. I checked it with two different gauges to verify. Oil pump taken apart looks clean no scoring the crank has no up and down play.
Just out of curiosity I tried the oil pump prime procedure, I could hear what I think is the oil pump straining but no different. Any ideas?

 

Priming the oil pump you should hear the whoosh of air pressure.
That doesn't sound to bad, the 500 doesn't put out high oil pressures, 12-20 @5500 rpm is still within spec.
My rebuilt motor with a new oil pump just hits 20 at WOT. I can try to match rpms with one that has a tach to see what mine has at 3 grand but as long as that's with a warm machine it sounds like that's okay.

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10psi at 3000 rpm is ok,just pull the oil tank dipstick and rev it up.Shine a flash light into the tank,should see oil bubbling,moving around in the tank from the oil return line.

 

Sorry for the confusion, it maxs out @ 10ish. I had it up to 7k and it read 10-11 psi. When I primed the pump I heard noise not air whooshing. Sounded like the pump was straining which is what I would expect.
Maybe I'm chasing a ghost, I'll go over it one more time before I put it back together

 

Little too low on oil pressure then. Check out the oil pump section as to what to check out along with rotor clearances.It's in the engine lower end section of the manual. If you don't have one,here's a cheap one.DOWNLOAD 1996-2003 Polaris Worker/Sportsman/Xplorer 400/500 Repair ...