3. INSPECTION/ADJUSTMENT MXU 550EXi/MXU500i FUEL LINE Fuel tubes Check the fuel tubes and replace any parts, which show signs of deterioration, damage or leakage. Do not smoke or allow flames or sparks in your working area. Fuel pump (1) (3) THROTTLE OPERATION Check the throttle to swing for smooth movement. Measure the throttle to swing free play. Free Play (A): 35 mm To adjust throttle free play: 1. Slide the rubber sleeve (1) back to expose the throttle cable adjuster (2). 2. Loosen the lock nut (3), then turn the (A) adjuster to obtain the correct free play. (3~5 mm) (2) (4) 3. Tighten the lock nut and reinstall the sleeve. Other checks: Check the throttle cable for kinks and signs of wear that could cause stretching or failure. Lubricate the throttle cable with a commercially available lubricant to prevent premature wear and corrosion. 3-4