WEN 56173 173 cc 6 HP OHV Vertical Shaft Gas Engine-CARB - Manual (Page 22)

Problem Cause Solution
Engine will not
start COMPRESSION RELATED: COMPRESSION RELATED:
Cylinder not lubricated.
Problem after long storage
periods. Pour tablespoon of oil into spark plug
hole. Crank engine a few times and try to
start again.
Loose or broken spark plug.
(Hissing noise will occur when
trying to start.) Tighten spark plug. If that does not work,
replace spark plug. If problem persists,
may have head gasket problem.
Loose cylinder head or
damaged head gasket. (Hissing
noise will occur when trying to
start.) Tighten head. If that does not remedy
problem, replace head gasket.
Engine valves or tappets
misadjusted or stuck. Have qualified technician diagnose/repair
ignition system.
Engine misfires Spark plug cap loose. Check wire connections.
Incorrect spark plug gap or
damaged spark plug. Re-gap or replace spark plug.
Defective spark plug cap. Replace spark plug cap.
Old or low quality gasoline. Use only fresh 87+ octane
unleaded gasoline.
Incorrect compression. Diagnose and repair compression.
(Use Engine will not start:
COMPRESSION RELATED section.)
Engine stops
suddenly Low oil shutdown. Fill engine oil to proper level. Check
engine oil before EVERY use.
Fuel tank empty or full of
impure or low quality gasoline. Fill fuel tank with fresh 87+ octane
unleaded gasoline.
Defective fuel tank cap creating
vacuum, preventing proper
fuel flow. Test/replace fuel tank cap.
Faulty magneto. Have qualified technician
service magneto.
Disconnected or improperly
connected spark plug cap. Secure spark plug cap.
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