Post by nanetteswisher on Sept 10, 2013 10:30:49 GMT -5
I just bought a brand new 150cc GY6 motor that came complete with CVT, Carb and all the little doohickies that connect to the motor. CDI, spark plug wire, etc... I have installed the new motor and it starts great. Idles great. BUT here is my problem, the damned thing sputters and pops and kind of backfires really loud when I give it throttle a bit and it won't go any faster than about 25. I have my carb connected to a mikuni fuel pump with filter etc. My scooter ran just fine before and was set up this way so I figured I could just pop the motor in and go. NO DEAL. I even put my old carb in which was rejetted and had ran just fine before on old motor. This didn't work either. 
I was getting over 70 MPG before I swapped motors. I am kind of "stupid girl" when it comes to mechanics and everything I have done to it I have picked up off of this site and watching youtube. I am pretty sure my motor is in right and all the wires are hooked up correctly. Wouldn't it not start if it was put in incorrectly? The only thing different is that I have not installed my NGK iridium spark plug yet because the parts store has to order it, I am still using the one that was sent to me with the new motor. I have messed with the air/fuel settings as well a little bit. But seemed to not make much difference. Some people say it needs adjustment in valves which I can do as I did on my old motor and I also have the feeler gauges for it. But would that cause my problem? Sorry to bomb you but I am just at a complete loss. My ex used to do it all for me and now I am just kind of flying blind and don't have the money to take it to a shop.
On another note, when the motor was shipped to me the tube from the back of the CVT was hooked to the front of the motor. Am I supposed to cut this tube in half and let both of them hang freely into the atmosphere? As of right now I just disconnected it from the head of the motor and left hanging from CVT but nothing from motor end just the bare metal tube.
Any help will be GREATLY APPRECIATED!!!! thanks so much for all your great information on your sites. It has helped me tremendously in the past!
I was getting over 70 MPG before I swapped motors. I am kind of "stupid girl" when it comes to mechanics and everything I have done to it I have picked up off of this site and watching youtube. I am pretty sure my motor is in right and all the wires are hooked up correctly. Wouldn't it not start if it was put in incorrectly? The only thing different is that I have not installed my NGK iridium spark plug yet because the parts store has to order it, I am still using the one that was sent to me with the new motor. I have messed with the air/fuel settings as well a little bit. But seemed to not make much difference. Some people say it needs adjustment in valves which I can do as I did on my old motor and I also have the feeler gauges for it. But would that cause my problem? Sorry to bomb you but I am just at a complete loss. My ex used to do it all for me and now I am just kind of flying blind and don't have the money to take it to a shop. On another note, when the motor was shipped to me the tube from the back of the CVT was hooked to the front of the motor. Am I supposed to cut this tube in half and let both of them hang freely into the atmosphere? As of right now I just disconnected it from the head of the motor and left hanging from CVT but nothing from motor end just the bare metal tube.
Any help will be GREATLY APPRECIATED!!!! thanks so much for all your great information on your sites. It has helped me tremendously in the past!
