i have a 1993 touring bike with an evo motor that i have had oil pressure problems since i put the engine in. i did not build the engine so i do not know much about this one. after installing, it took a while for the engine to get oil pressure. i ran it at idle for about a minuite and when it still was not going up i started priming everything i could get to. after that it got oil pressure to about 30psi. but after driving for about a half hour, the pressure drops to about five at idle and ten while driving. does anyone know how i can boost this pressure up. i believe it is one of the springs in the oil pump but i am not sure. any help is apreciated.