Do you have a manual? If so, read the proceedure for a complete dismantling of the carb, label where each jet and small part comes from. You may need to drill out the plug that is covering the pilot jet screw. Just use a small drill bit and then use a small screwdriver to pry it out.
There are how-to's here I'm sure to help you deal with the carb.
I am a firm believer in Pinesol, yes the household cleaner, to soak the carb in. I leave it in for 24 hours and give it a shake halfway through the time, if it has dirt stuck to the outside I use a toothbrush to scrub it clean. Place all parts except the diaphram and the other diaphram on the side of the carb. It controls the back fire, I just can't think of it's name....damn minds gone blank...lol....the slider will get eaten a bit and will need to be polished after you soak it that is why I don't soak it any more. Once the parts etc have soaked for 24 hours they can be cleaned off with hot water. Then get some spray carb cleaner and use it on all air/fuel passage ways to make 100% they are all clear of Pinesol and any other dirt etc. Then I use compressed air to blow out the carb spray. Be careful when you spray the carb cleaner as it will come squirting out of passages and can hit you in the face...beware!
Once it's all cleaned and you are happy with the result, start the rebuilding....take your time and get it right...it's real easy to forget where certain things go if it's your first time. This is why I said to write it all down when you dismantle it.
Search out the how to for setting up the carb, there are a few inexpensive mods you can do while it's apart to enhance the performance and throttle response.
Hope this helps.....if you need more info just ask.