Recently bought a 1996 xr600r. The old bike is in decent shape(ill post pictures later) but after determining the engine was not receiving oil to the top end, i tore it down and am in the process of rebuilding it. Actually waiting on gaskets to put it back together. My question is where should i start trying to diagnose the problem? I loosened the top banjo bolt to check while running and no oil. I did check the oil filter was installed correctly. Any help would appreciated. Thanks, Brent This old bike proves that Honda's are tough, i rode a few hours in hot weather with no knowledge there was no oil flow. Engine never made any noise, no indication of a problem. Finally got to the point of the valve train getting very noisy, thats when i started investigating. And actually the cylinder and piston wasn't hurt, the head, valve cover, cam and rocker arms took the grunt of the blow. I bought a used head, camshaft, and valve cover off ebay to repair it. Also went ahead and bought a new sleeve piston and rings since its apart this far.