Kled only gets Courage KILLING minions, 4 courage per minion. His gun only works on Champions to get back courage. That self knock back doesn't mean jack squat running away, considering most top laners have 330-335 MS, meaning they'll easily catch up.
Not to mention Kled most likely has his W on Cd from the initial attack, while also only doing 80% AD on Autos while dismounted. His Gun can give a max of 50 courage if he lands every bullet in both shots, which requires him to be literally in your face, which means his health bar is just as accessible as yours.
Final thing, if you're allowing him to kill 25 minions to bring back Skarrl, while he sits there with his low max health limit, you can easily outheal him with a potion or two then go back in.