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SKU 94187 For technical questions, please call 1-800-444-3353
Engine Difficult to Start
Symptom Probable Cause Possible Remedy
Engine difficult to start
– Cylinder compression
OK
– Spark OK
Fuel supply blocked:
1. Air vent in Gas Cap clogged.
2. Gas Valve plugged up
3. Main jet clog or misadjusted
4. Needle valve improperly
closed or start hole is clogged
5. Floater in fuel tank is
damaged or sticking
1. Clean Gas Cap air vent
2. Unclog Gas Valve
3. Clean and/or readjust
4. Take apart needle valve and
repair, clean, and blow out
5. Repair floater
Engine difficult to start
– Cylinder compression
OK
– Spark OK
– Gas supply OK
Fuel system problem:
1. Gas dirty, has water, or is old
2. Engine cylinder flooded
3. Gas wrong type
1. Drain gas and replace
2. Drain extra gas, dry spark
plug electrodes
3. Drain gas and replace
Engine difficult to start
– Cylinder Compression
OK
– Gas supply OK
– Ignition coil spark OK
1. Spark plug has carbon
buildup or dirt on and around
electrodes
2. Electrodes are burned
3. Improper spark gap
1. Remove spark plug and
clean
2. Replace spark plug
3. Adjust spark plug electrodes
Engine difficult to start
– Gas supply OK
– Ignition system OK
1. Piston ring worn
2. Piston ring is sticking
3. Piston ring broken
4. Spark plug loose or without a
gasket
5. Air leakage between cylinder
block and cylinder
6. Air leakage in valve
1. Replace piston rings
2. Clean out carbon fouling
3. Replace piston ring
4. Tighten with a gasket
5. Check cylinder gasket and
bolts
6. Check valve clearance and
thickness, repair if required