I'm New to this site! And I must say I'm thoroughly impressed with the info.Is there any one that can tell me where I can measure oil pressure and what I should expect to see on my 87 xr600. I'll make this as short and sweet as possible. I purchased this this bike with the engine tore appart due to a cam starved of oil. The guy I bought it from claims he did NOT run it out of oil and changed it periodicaly. I inspected all the componants, replaced what was bad,(cam,rocker levers,timing gear,timing chain,valve job ect...) including a new oil pump, side cover orings and seal. Started it up of course I was very courious to know if my valve assembly was getting oil or not, I made my own special adapter fitting that I screwed through the banjo at the lower end (inlet) of the external oil supply line to the rocker hsg so I could hook it to a gage and measure oil pressure while running. Here are the results 10-12psi when cold. pressure drops as engine warms up to basicly nothing. If I take the hose off the gage with with the engine still hot and running, hold it over a pail oil WILL flow ever so slightly.I have studied this xr oil flow quite extensivly and the only other thing that section of the oil pump feeds is the crankshaft, my concern is could there be too much clearance and bleeding off there. The engine does Not tick rattle or make any noises, runs great, Can this possibly be enough oil for the valve and rocker assembly???