Have changed the intake gaskets.No too much improvement.Still no cold start without spray.After, I tried to adjust the CO screw as much as will start easy at cold.It is ok, but a lot of white smoke, and the idle it is a little bit erratic, and it have a slow acceleration when I press the throttle linkage.Also, the economy needle stays at 1/3 from minimum, at idle.The idle speed is at 700rpm.When I accelerate it to 1000 rpm, the economy needle is very near to minimum.Any idea what to do next?