You need a carb rebuild kit and the big 1 gallon can of "gunk" carb dip. Also you need to download a copy of the atc110 service manual that you can find on here and some metric tools and you should be on your way. Welcome to the site. I don't think more than $25 for a carb rebuild kit. Have fun and get busy. Be careful on your carb, the metal is kind of soft and your hi and lo speed jets are made of brass and you can mess them up fairly easy if you're not careful and take your time.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90