Oil Pressure Light / Switch

I measured oil pressure.
With cold oil at idle is 0,6-0,8 bar but when is hot it drops almost to 0
At 2000 rpm is 1 bar. When is cold at 5000 rpm relief valve works at 4,5 bar, but when heats can't go more than 4 bar.
Engine don't make any rattling noises.
Oil pumps are measured and is within limits.
I don't think these values are ok, any suggestions?

Are you sure the banjo bolt going into the cylinder head oil feed has the 1.4mm restricted hole banjo bolt ? I measured about 1.1 bar cold and 0.8 bar hot on a 900 at 1150 rpm idle with the correct restrictor bolts in.

At anything off idle the pressure rose quickly to about 4.2 bar and stayed there from about 3500 rpm onwards.

EDIT: I did use a 0-5 bar gauge though.

Edited by leehenty, 21 June 2010 - 01:37 pm.

Original banjo bolt have 1mm hole for feeding the head. Oil switch adapter on my bike is with 1,3-1,4 mm hole.
Central opening - from crankcase to switch is larger - 3 or 4 mm, as on original banjo bolt.
Just measured on a friend's XTZ750 - same readings. Or almost same.
Manometer is 0-16 bar, I don't have 0-5, it will show more exact readings.
Now I'm going to install 0.3 bar switch and suppose everething will be ok. I hope so.