SERVICE ENGINE your John Deere dealer. 4. Disconnect spark plug wire(s) (A), one on each side on V-twin engines. 5. Remove spark plug(s). Replacing Fuel Filter 6. Clean spark plug carefully with a wire brush. 7. Inspect spark plug for: Cracked porcelain. c CAUTION: Avoid injury! Fuel vapors are explosive and flammable: Pitted or damaged electrodes. Other wear or damage. Do not smoke while handling fuel. NOTE: In Canada, replace spark plug with resistor plug only. Keep fuel away from flames or sparks. Shut off engine before servicing. 8. Cool engine before servicing. Work in a well-ventilated area. Clean up spilled fuel immediately. NOTE: Change filter when fuel is low. 1.
Park machine safely. (See Parking Safely in the SAFETY section.) c CAUTION: Avoid injury! Touching hot surfaces can burn skin. The engine and components will be hot if the engine has been running. Allow the engine to cool before servicing. 2. Let engine cool. 9. gap, move the outer electrode. 3. Lift hood. Gap must be 1 mm (0.040 in.). 4. Put a drain pan under fuel filter. 10.Install and tighten spark plugs to 20 N•m (15 lb-ft). 11.Connect spark plug wires and lower hood. Service Engine - 37 A MX10526 Picture Note: Model 17.542 used for photo purposes. Adjusting Carburetor NOTE: Carburetor is calibrated by the engine manufacturer and is not adjustable.
If engine is operated at altitudes above 1829 m (6,000 ft), some carburetors may require a special high altitude main jet. See your John Deere dealer. If engine is hard to start or runs rough, check the troubleshooting section of this manual. Possible engine surging will occur at high throttle with transmission in “N” neutral and mower engagement lever disengaged. This is a normal condition due to the emission control system. After performing the checks in the troubleshooting section and your engine is still not performing correctly, contact spark plug as necessar B