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163
TROUBLESHOOTING
Engine will crank (turn over) but will not start:
Cold engines require the choke to be ON to start. (Look at the carburetor and verify
that the choke lever is UP).
Warm engines will foul the spark plug if run with the choke on, check that the choke is
OFF (Lever is DOWN on the carburetor)
Throttle should be 1/8 to ¼ open during cranking.
Check fuel:
Verify that fresh fuel is in the tank, petcock is ON or RESERVE (Depending on fuel
level in tank).
Open the drain screw on the carburetor and verify that fuel flows out, see page 24. (Put
a pan under the drain hose to catch the fuel) Fresh fuel is clear, and has a sharp, acidic
smell; yellow fuel indicates stale fuel, the engine will not start with stale fuel.
If fuel does not flow from the carburetor, remove the fuel hose from the carburetor and
check for fuel flowing from the fuel valve (petcock). If fuel does not flow out of the hose,
the fuel valve (petcock), fuel hose and/or sediment bowl may be clogged and need
cleaning.
If fuel flows from the fuel hose, and not from the carburetor drain, the float needle in the
carburetor may be stuck closed. Disassembly and cleaning of the carburetor is
required.
The fuel tank is vented to the atmosphere (through the EVAP System) to allow fuel to
flow out. If fuel does not flow out of the tank, or is slow, inspect the tank vent hose and
related parts of the EVAP system for blockage. Opening the fuel cap will fully ventillate
the tank to bypass a blocked tank vent.
Check spark:
Remove the spark plug. The ceramic insulator should be white to light brown in color. If
the insulator is black with carbon deposits, replace. If the insulator is white but wet with
fuel, replace the spark plug or allow the spark plug to dry.
Check for spark. Lay the spark plug base against the engine, with the ignition wire on.
Do not hold the spark plug with your hand, you will receive a shock!
Crank the
engine; you should see a blue spark at the gap. (Please note, you may not see the
spark in bright sunlight) Spark plug gap is 0.6mm.
If a blue spark is visible, reinstall the spark plug.
If no spark is present, see Ignition system,
page 147.
DO NOT TOUCH THE SPARK PLUG OR PLUG CAP
WHILE TRYING TO START THE ENGINE. YOU WILL
RECEIVE AND ELECTRICAL SHOCK WHICH COULD
RESULT IN SERIOUS INJURY OR DEATH.
NOTICE