I don't recall if you have a service manual or not .
Here's a link : Google selection .
Take your pick .
As for the carb adjustments , the best place to start is set them as close to factory as possible . Check the manual .
Exhaust : Cheap dollar store oven cleaner works pretty good for me . Fill the pipe and let it work a while . Rinse with the garden hose and repeat .
Your pipe will end up clean as new , inside . ;)