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Shorted ignition ground. Faulty ignition unit. Move switch to “I” (ON) position and restart. Consult with an authorized servicing dealer. NOYESYESCheck the spark plug. If the plug is wet, excess fuel may be inthe cylinder. The plug is fouled or improperly gapped. The plug is damaged internally or of thewrong size. Crank the engine with the plug removed, reinstall the plug and restart. Clean and regap the plug to 0.024 - 0.028inch (0.6 - 0.7 mm). Restart. Replace the plug with an NGK BPMR6A orequivalent resistor type spark plug of the correct heat range. Set spark plug electrode gap to 0.024 - 0.028 inch (0.6 - 0.7 mm). YESWhat To Check Possible Cause Remedy LOW POWER OUTPUT Is the engine overheating? Operator is overworking the unit. Carburetor mixture is too lean. Improper fuel ratio. Fan, fan cover, cylinder fins dirty or damaged. Carbon deposits on the piston or in the muffler. Shorten trimmer line. Cut at a slower rate. Consult with an authorized servicing dealer. Refill with fresh, clean unleaded gasoline with a pump octane of 87 or higher mixed witha 2-cycle air cooled mixing oil that meets orexceeds ISO-L-EGD and/or JASO FC classifiedoils at 50:1 gasoline/oil ratio. Clean, repair or replace as necessary. Consult with an authorized servicing dealer. Possible Cause RemedyEngine is rough at all speeds. May also haveblack smoke and/or unburned fuel at the exhaust. Clogged air cleaner element. Loose or damaged spark plug. Air leakage or clogged fuel line. Water in the fuel. Piston seizureFaulty carburetor and/or diaphragm. Service the air cleaner element. Tighten or replace. Repair or replace filter and/or fuel line. Replace the fuel. See page 10. Consult with an authorized servicing dealer. Engine is knocking.Oveheating condition. Improper fuel. Carbon deposits in the combustionchamber. Check fuel octane rating; check for presence of alcohol in the fuel (page 10). Refuel as necessary. Consult with an authorized servicing dealer. What To Check See above(Engine overheating). Troubleshooting Guide (continued) ADDITIONAL PROBLEMS Poor acceleration. Clogged air filter. Clogged fuel filter. Lean fuel/air mixture. Idle speed set too low. SymptomPossible Cause RemedyEngine stops abruptly. Switch turned off. Fuel tank empty. Clogged fuel filter. Water in fuel. Shorted spark plug or loose terminal. Ignition failure. Piston seizure. Reset the switch and and restart. Refuel. See page 10. Replace fuel filter. Drain; replace with clean fuel. See page 10. Clean and replace spark plug, tighten the terminal. Replace the ignition unit. Consult with an authorized servicing dealer. Engine difficult to shut off. Ground (stop) wire is disconnected or switch is defective. Overheating due to incorrect spark plug. Overheated engine. Test and replace as required. Idle engine until cool. Clean and regap the plug to 0.024 - 0.028inch (0.6 - 0.7 mm). Correct plug: NGK BPMR6Aor equivalent resistor type spark plug of thecorrect range. Idle engine until cool. Cutting attachment rotatesat idle. Engine idle too high. Broken clutch spring or worn clutchspring boss. Loose attachment holder. Engine will not idle down. Engine idle set too high. Engine has an air leak. Clean the air filter. Replace the fuel filter. Consult with an authorized servicing dealer. Adjust: 3,000 ( 250) RPM (min )-1Set Idle: 3,000 ( 250) RPM (min ) Replace spring/shoes as required, checkidle speed. Inspect and re-tighten holders securely. -1Set Idle: 3,000 ( 250) RPM (min ) Consult with an authorized servicing dealer. -1 ADDITIONAL PROBLEMS SymptomPossible Cause RemedyExcessive vibration. Warped or damaged cutting attachment. Loose gearcase. Bent main shaft/worn or damaged bushings. Trimmer line not wound properly on spool. Inspect and replace attachment as required. Tighten gearcase securely. Inspect and replace as necessary. Rewind trimmer line. Cutting attachment willnot rotate. Shaft not installed in powerhead or gearcase. Broken shaft. Damaged gearcase. Inspect and reinstall as required. Consult with an authorized servicing dealer. The following statement only applies to United States and its territories Shindaiwa Corporation Federal Emission Design And Defect Limited Warranty Utility And Lawn And Garden Engines Shindaiwa Corporation warrants to the initial purchaser and each subsequent owner, that this utility equipment engine (herein engine) is designed, built and equipped to conform at the time of initial sale, to all applicable regulations of the U.S. Environmental Protection Agency (EPA), and that the engine is free of defects in materials and workmanship that would cause this engine to fail to conform with EPA regulations during its warranty period. This emission warranty is applicable in all States, except the State of California. For parts listed under PARTS COVERED, the dealer authorized by Shindaiwa Corporation will, at no cost to you, make the necessary diagnosis, repair, or replacement of any defective emission-related component to ensure that the e...
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