HI; I have oil slowing dripping out of one carb air intake, I am lead to believe that this has to due to a check valve in the oil pump, I note that the conversation kits for 1986 PROJ 150 Yamaha has check valves in the lines going to the carb, but these check valves are not on the orginal oil lines with the orginal pump. Do I install the check valves in the lines and leave the orginal pump, or do I replace the pump with the orginal pump or do I replace with the conversation kit pump???? The local dealer doesn't know the Yamaha help desk doesn't know. Tks MGA
