29 CS-450PTROUBLESHOOTINGWARNINGFuel vapors are extremely flammable andmay cause fire and/or explosion. Never testfor ignition spark by grounding spark plugnear cylinder plug hole, otherwise seriouspersonal injury may result.ProblemEngine — hard to start Cause Remedy— does not startEngine Fuel at No fuel • Fuel filter clogged • Clean or replacecranks carburetor at carburetor • Fuel line clogged • Clean• Carburetor • Ask your ECHO dealerFuel at No fuel at • Carburetor • Ask your ECHO dealercylinder cylinderMuffler wet • Fuel mixture is too rich • Open chokewith fuel • Clean/replace air filter• Adjust carburetor• Ask your ECHO dealerSpark at No spark at • Ignition switch off • Turn switch onend of end of plug • Electrical problem • Ask your ECHO dealerplug wire wire• Spark gap incorrect • Adjust 0.6 mm to 0.7 mmSpark at No spark at • Covered with carbon • Clean or replaceplug plug • Fouled with fuel • Clean or replace• Spark plug defective • Replace plugEngine • Internal engine problem • Ask your ECHO dealerdoes notcrankEngine Dies or • Air filter dirty • Clean or replaceruns accelerates poorly • Fuel filter dirty • Clean or replace• Fuel vent blocked • Clean• Spark plug • Clean and adjust/replace• Carburetor • Adjust• Cooling system blocked • Clean• Exhaust port/spark • Cleanarrestor screen blocked