I have a tecumseh ohv 175 203804a clean the carb and no change when a start it it will run rough with black smoke for a few second and then it's find. If I give it more throttle it will do the same thing with black smoke. Now I've notice the carb solenoid have a spring and a rubber missing so I'm wondering if it will give to much gas or it have nothing to do with it. Another thing there's a big leak a the head of the motor where the exhaust its attached and will cause less back pressure. Other then that I have no other ideas what will cause this problem if anyone can give me tips. Maybe the carb is still not clean enough.