U replaced the carb?? With an aftermarket keihin clone off of something like eBay?? The two I tried years ago were untuneable!! I have two oem ones that have been sitting clean in a hobbit carb box. Pm me if u want to buy one . Or simply post for one in the buy sell. If it's not ur seals it's the most likely culprit. U can replace the seals without disassembling the case if u carefully drill a sheetrock screw into the body of the seal without scoring either the crank or the case and use the screw to pull out the seal. Then press in the appropriate seals that treatland or does cycles can sell you with an appropriate ly sized socket.