You probably just have dirty carbs. Seafoam is very recommended in this forum to keep everything clean. Fill up the gas tank and use I think a third of the can? Not sure if that's it, someone else will confirm.
Anyway, seafoam will help you out with any hiccups you might have because of carb dirt or gunk or whatever. For bigger problems you should take out the carbs, take them apart and use carb cleaner.
There are two places that the choke cable attaches to. What the choke cable activates is something kinda like a rail on the carbs, so look along that rail... it should move when you apply the choke. On one end, you insert the barrel looking tip of the cable and twist so that the cable itself is secured... move to the other end of the rail and you'll find a sort of housing... I think it's kinda triangular in shape. This is where the elbow of the choke cable goes.
When you try to put it on, first you put the elbow into the housing and then you put the barrel looking tip on the other end. Hope you can find it with this explanation. If not, I can try to take a pic or two after work tomorrow.