Mo, I have a 2 stroke 50cc scooter that I just put one of your big bore kits on. I can’t find any information on how to bleed the oil pump.Tom.
Tom, Bleeding the oil pump is fairly straight forward and something some people tend to overlook. You want to make sure you get all the air out of the system so you don’t damage the motor. First, you want to make sure that the oil tank and the oil supply hose is full of oil. To check the hose, simply disconnect the hose from the pump and make sure oil flows out the hose and then reconnect it. Next, loosen the bleed screw on the pump and wait until oil flows out of the hole without air bubbles, and then retighten it. Double check the oil supply tank at this time to make sure it is still full. Now you want to disconnect the pump outlet hose from the carburetor. Make sure the key is off and use the kick starter to crank the motor while watching the hose until oil flows without air bubbles, and then reconnect the hose. You could also use an external fuel tank with premixed gas and run the motor and follow the above procedure.
Caution: Do not crank the motor on the starter or run a 2 stroke motor without an oil supply. Also do not crank a 2 stroke with the ignition on and the spark plug disconnected; you could damage the ignition system.