I have a dr200se no clue on what year it is but it starts a little hard and whenever you touch the throttle it won't rev it just dies but there's no air filter on it and I believe the carburetor slide is vacuum activate and I'm wondering if the port on the back for the vacuum and having no air filter has something to do with the reason it won't rev up and there's no vacuum lines coming off the carburetor anymore no clue where they went please help