TROUBLESHOOTING Using Troubleshooting Chart If you are experiencing a problem that is not listed in this chart, see your John Deere Servicing Dealer for service. When you have checked all the possible causes listed and you are still experiencing the problem, see your John Deere Servicing Dealer. H L T * Note: This engine complies with EPA (Environmental Protection Agency) and CARB (California Air Resource Board) regulations which require exhaust emission control. As a result, the carburetor adjustment needles are equipped with plastic caps that limit the rotation from the original factory adjustment.
If your unit exhibits specific performance problems that can not be corrected by the Trouble Shooting Section, the unit should be taken to a John Deere Servicing Dealer for repair. 26 English PROBLEM POSSIBLE CAUSE SOLUTION Engine will not start: (Make sure Ignition switch is in start position “I”.) 1. No spark 2. Flooded engine. 1. Check Spark. Remove air filter cover. Remove spark plug from cylinder. Reattach the spark plug wire and lay spark plug on top of cylinder. Pull the starter rope and watch for spark at spark plug tip. If there is no spark, repeat test with a new spark plug. 2. With the ignition switch off, remove spark plug.
Move choke lever to run position (pushed in completely) and pull starter cord 5 to 20 times. This will clear excess fuel from engine. Clean and reinstall spark plug. Pul starter three times with choke lever at run. If engine does not start, move choke lever to choke and repea normal starting procedure. If engine still fails to start repeat procedure with a new spark plug. Engine starts but will not ac- celerate properly: Carburetor requires “L” (Low jet) adjustment. * Contact a John Deere Servicing Dealer for carburetor adjustment. Engine starts but will not run properly at high speed . Carburetor requires “H” (High jet) adjustment.
* Contact a John Deere Servicing Dealer for carburetor adjustment. Engine does not reach full speed and / or emits exces- sive smoke: 1. Check oil fuel mixture. 2. Air filter dirty. 3. Spark arrester screen dirty. 4. Carburetor requires “H” (High jet) adjustment. 1. Use fresh fuel and the correct 2-cycle oil mix. 2. Clean per instruction in Maintenance-Air Filter Sec tion. 3. Clean per instructions in Maintenance-Spark Arrest- ing Muffler Section. 4. * Contact a John Deere Servicing Dealer for carburetor adjustment. Engine starts, runs, and ac- celerates but will not idle. Carburetor requires adjustment. Turn idle speed screw “T” clockwise to increase idle speed.
(If chain turns at idle, turn idle speed screw “T” counterclockwise to decrease speed). Wear protective equipment and observe all safety instructions. Bar and Chain Running Hot and Smoking: Engine starts and runs, but chain is not rotating: 1. Chain oil tank empty. 2. Check chain tension. 3. Check for oiler function. 1. Oil tank should be filled every time that fuel tank is filled. 2. Tension chain per instructions in Operation-Chain Tension section. 3. Run at full throttle 15 to 30 seconds. Stop saw and check for oil dripping from Safe-T-Tip and guide bar If oil is present the chain may be dull or bar may be damaged. If no oil contact a John Deere Servicing Dealer. 1. Chain brake engaged.
2. Check guide bar and chain assembly. 3. Check guide bar and chain for damage. 1. Release chain brake, see Operation-Chain Brake Section. 2. Refer to Assembly-Assembling the Bar and Chain Section. 3. Inspect guide bar and chain for damage.