Tools Needed

Spark plug socket · Adjustable wrench or metric socket set · Phillips head screwdriver · Carburetor cleaner spray · Inline spark tester · Needle-nose pliers · Small wire brush

Quick First Checks

• Check oil level — must be at the top thread of the fill port to deactivate the low-oil sensor.
• Verify the Fuel Valve is ON and the engine switch is in the ON/RUN position.
• Drain the carburetor bowl using the 10mm drain bolt to check for water or stale fuel.
• Inspect the air filter for heavy oil saturation or clogs that block airflow.
• Check for spark using a tester — gap should be set to 0.028-0.031 inches (0.7-0.8mm).
• Disconnect the yellow wire from the Low Oil Alert sensor to test for a faulty sensor grounding the spark.

Repair Steps

• 1. Verify Spark Integrity

  Remove the BPR6ES spark plug, reattach the plug wire, and hold the threaded body against the engine block while pulling the recoil. You should see a bright blue, audible snap; if the spark is yellow or nonexistent, troubleshoot the ignition coil or kill switch.

  ⚠ Ensure the spark plug is held firmly against a clean metal surface to prevent electrical shock or igniting stray fuel vapors.

• 2. Drain and Clean the Carburetor Bowl

  Place a container under the carburetor and loosen the 10mm drain bolt on the bottom of the float bowl. If the fuel appears milky or smells like turpentine, remove the bowl entirely to clean the sediment with aerosol carburetor cleaner.

  ⚠ Work in a well-ventilated area away from open flames or hot surfaces, as gasoline fumes are highly flammable.

• 3. Clean the Main and Pilot Jets

  Remove the main jet and pilot jet using a flat-head screwdriver. Use a thin strand of copper wire or a specialized jet cleaning tool to clear the orifices, then blow them out with compressed air to remove loose varnish.

  ⚠ Use eye protection when using compressed air to avoid blowback of cleaning chemicals or debris into your eyes.

• 4. Inspect the Float Assembly

  Ensure the float pivots smoothly on its hinge pin and that the needle valve seat is clean. If the needle has a visible rubber ridge or groove, it must be replaced to prevent fuel flooding.

  ⚠ Be gentle with the float; it is often made of delicate plastic or thin brass that can deform easily.

• 5. Bypass the Oil Alert Sensor

  If the engine still won't start, unplug the yellow wire at the bottom of the crankcase. If the engine starts immediately, your oil sensor is faulty and should be replaced rather than kept bypassed.

  ⚠ Never operate the engine with a low oil level; ensure the oil is filled to the top of the fill neck threads before starting.

• 6. Check Ignition Coil Gap

  Loosen the two 10mm bolts holding the ignition coil and insert a plastic feeler gauge between the coil legs and the flywheel magnets. Rotate the flywheel until the magnet aligns with the coil, tighten the bolts, and remove the gauge.

  ⚠ Ensure no metallic debris is trapped between the magnet and the coil, as this will cause erratic timing.

Avoid These Mistakes

• ✕ Using steel needles or drills to clean jets, which permanently alters the fuel-to-air ratio
• ✕ Forgetting to turn the fuel petcock to the ON position
• ✕ Using starter fluid for too long, which strips cylinder walls of essential lubrication
• ✕ Over-tightening the carburetor bowl nut, which can crack the delicate alloy housing

Prevent Recurrence

• Use a fuel stabilizer in every gas can to prevent ethanol phase separation
• Shut off the fuel petcock and run the engine until it stalls before long-term storage
• Change the engine oil every 50 hours of operation to keep the Oil Alert system functioning correctly
• Store the pressure washer in a dry environment to prevent moisture condensation in the fuel system