Locate the high-speed adjustment screw. If your carburetor has one, it will be on the opposite side of the carburetor from the idle adjustment screw. Turn the screw clockwise until it just touches the seat, then back it off counter-clockwise one-and-one-half turns.
Set the throttle to fast and start the mower engine. Turn the high speed screw first clockwise until the engine slows, then counterclockwise until it slows. Locate the center point where the engine idles best. Move the throttle from slow to fast then back to slow to test the adjustment.
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CRAFTSMAN 502.270210 Manual Online: How To Adjust The Carburetor, Adjust Throttle Control,. 13.5 hp. electric start 30" mower / mulcher 5 speed rear engine rider.. . Lawn and Garden Equipment Craftsman 88970 – 208 CC 26 in.