1) Recently had the carbi cleaned and new kit put it. It still leaks from the adjustment screw (bottom - 2 turns). Just old and worn?
2) suddenly went onto full revs doing slashing last week. No throttle control. Likely cause? spring, cork doova behind dash ...?
Did the Tractor eventually idle down? Did you turn the ignition off and then back on? Did you manage to idle engine down?
Will Tractor start and idle now?
Is this Carburetor on your TEA-20?