I have a L8 that is not running. I took the carb apart to clean in and the venturi fell right out. What should I do to fix it? It also has weak spark. It had no spark so I cleaned the points and not it has weak spark. When I crank the engine with a spark plug tester on it, it has decent sparks when the mag snaps 2 times then it shows a continuous weak spark. This happens every time I try it. Any thoughts?