Well I've got myself a bit of a situation here. My 400 recently started bogging badly at any throttle position and is extremely hard to start (I usually have to jump it). I've completely cleaned the air filter, the carburetor and put in a fresh plug. The problem persists. What do you think I should check next, all the electrical; or is possible that my valves being too far out of spec would do this? Oh, and I'm running all stock jets and the needle at position/groove #3 (from the top - 1 groove leaner). Any suggestions are totally appreciated!