Air System Repairs

• 1). Unscrew the air filter cover and remove the filter from the engine. Wash the air filter in warm, soapy water. Air-dry it overnight before reinstalling it. Replace it if it's too dirty to clean.
  
  
• 2). Remove the muffler cover. Pull out the spark arrestor screen. Wash it in the warm, soapy water and scrub with the brush to remove any black carbon deposits. Replace it if it's too dirty to clean. Check the exhaust port inside the muffler for any carbon clogs and build-up. Clean it if necessary.
  
  
• 3). Remove the starter cover, pulley, recoil spring and starter cord from the engine. Inspect them for any damage and replace them if necessary. Check the flywheel for any damage and make sure it spins freely on the crankshaft.
  
  
• 4). Remove the cylinder cover and piston. Check the cooling fins, cylinder threads and cylinder walls for any dents or heavy carbon build-up. Check the piston ring for any dents or chips. Buff out if necessary or replace the piston.
  
  

Fuel System Repairs

• 1). Drain and rinse out the gas tank with a little soapy water. Scrub the tank clean with the brush and rag. Check the vent hole on the gas cap and make sure it's not plugged. Clean it with a pin if necessary.
  
  
• 2). Disconnect the fuel line from the elbow connector on the carburetor. Pull the fuel line and fuel filter out through the gas tank. Replace and install the new fuel filter and fuel line. Fill the trimmer with freshly mixed fuel at a 40:1 fuel-oil mixture.
  
  
• 3). Try starting the trimmer again. If it still won't start remove and disassemble the carburetor. Clean all of the filters and screens. Check that the inlet and outlet valves are clean and free. Check the diaphragm in the mixing chamber for any warping.
  
  
• 4). Clean the whole carburetor in a carburetor cleaner bath overnight. Scrub it clean with the brush the next day. Reinstall the carburetor with a carb kit or replace your carburetor.
  
  

Ignition System Repairs

• 1). Remove the spark plug's rubber connecting wire. Check the metal points inside the plug for any rust or damage. Check the cable and plug for any loose connections. Check the cable for any frayed or broken wires.
  
  
• 2). Remove the spark plug from the engine. Install a new spark into the rubber plug. Hold the plug and spark plug close to a metal spot on the cylinder. Pull the starter cord and look for a spark.
  
  
• 3). Disconnect the ground wire to the "On/Off" switch and repeat the test if there's no spark. If there's still no spark remove the throttle cable, two ignition lead wires and "On/Off" switch and inspect them for damage. Replace them if necessary.
  
  
• 4). Check the distance from the flywheel key to the starter to make sure they're set properly. Test your starter and coil. Replace them if necessary.