I have an 08 450XCF that has give nothing but problems this year. to make a long story short, i have figured out that the motor is not pumpimg enough oil. How critical is the plastic oil pumps. I am going to replace both suction pumps and the pressure pump but i won't to be sure this is the problem. To the naked eye, they look fine. I have completly disassembled the engine to clean all oil passages, any suggestions?