So that the throttle valve cannot stick there must be a clearance - a hairline gap - between the throttle valve and bore. Loosen nut (1). Loosen screw (2) until there is play at stop (3). Tighten screw (2) up to stop (3). Let the operating lever accelerate back several times. Tighten screw (2) by 1 turn and tighten nut (1). Adjust throttle valve switch - see 13 63 544. Adjust engine idle speed - 13 00 054. 13 63 544 13 00 054
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13 63 544