Hitachi CS 51EA, Service Manual

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Seized or broken piston ring Replacement
Seized piston or cylinder Replacement
Seized or broken needle bearing of the crank
shaft
Replacement
Seized ball bearing Replacement
Magneto rotor contact with ignition coil Adjustment
Broken recoil starter Inspection/replacement
Faulty starter pawl Inspection/replacement
Faulty piston ring Cleaning/replacement
Worn piston ring Replacement
Worn piston Replacement
Worn or damaged oil seal Replacement
Worn cylinder Replacement
Defective sealing of the packing Replacement
Defective decompression valve Replacement
Remove foreign matter. Disassembly/cleaning
Stop switch not at startup position
Setting to startup
position
Dirty or faulty spark plug Cleaning/inspection
Improperly connected plug cap Inspection/replacement
Disconnected or improperly connected high
voltage cord and other wiring
Inspection/replacement
Ground connection of high voltage cord and
other wiring
Inspection
Disconnected or faulty ignition coil
Replacement
Excessive gap between magneto rotor
circumference and ignition coil
Adjustment
No fuel in fuel tank or improper mixing ratio
Add properly mixed fuel
(25:1 to 50:1).
Clogged fuel filter Cleaning/replacement
Bent fuel pipe Adjustment
Cracked fuel pipe Replacement
Fallen fuel pipe Connection
Faulty tank vent hole (inner cap) Replacement
Faulty pump diaphragm of carburetor ass’y Replacement
Dirt-clogged carburetor ass’y Cleaning
Poorly adjusted carburetor ass’y Adjustment
Starter handle pulled repeatedly with choke
button pulled out (set at “startup”) Dry the spark plug.
Remove excessive fuel.
Repair flowchart
Pull the starter handle.
Is pulling possible?
Remove the spark plug to
check for sparks.
Sparks are generated.
Dry
There is compression.
Return the spark plug
and plug cap to the
original positions, and
then perform proper
startup operation.
Confirm that the tip of the
spark plug becomes wet
with fuel.
Wet spark plug due to
excessive supply of fuel
OK
Is the spark plug
contaminated with foreign
matter?
Contaminated
No spark
Impossible to pull
OK
No compression
OK
Wet
OK
OK
OK