Also, I Took everything apart and cleaned it and could not get the bubbles to stop coming when I pressurized it. At first before I took it apart I swear the bubbles were coming from around the screw and/or retaining plate that holds seat down but then after cleaning it, it looked like it was bubbling from the seat area. Now I’m scared it will do the same after my rebuild kit comes in. It was rusty just like the one in your thread. That machine has an Uxbridge small engine racing sticker on it, even though the spring and probably needle and seat were not correct everything else pointed to it having genuine Mikuni parts in it. Is it possible that it had some after market parts on it before and the spring, needle and seat were changed to accommodate the after market parts? Just asking, I have no idea what I’m even talking about