Troubleshooting Guide; Troubleshooting And Correction - Hitachi CG 25EUAP (L) Service Manual

1. Troubleshooting and correction

Problem
Starter handle
The crank shaft
cannot be
does not rotate.
pulled.
The plug does not
become wet with
fuel after repeated
startup operation.
No spark
Startup is
impossible.
Short-circuited due to foreign matter between the plug
electrodes.
No compression
Weak spark
Idling stops
although
Low compression
startup is
possible.
Good spark and
compression

TROUBLESHOOTING GUIDE

The piston ring is stuck.
The connecting rod bearing is stuck.
A valve is damaged.
The crank gear or cam gear is
damaged.
The magneto rotor touches the
ignition coil.
The fuel tank is empty.
The fuel filter is clogged.
The air hole in tank cap is faulty.
The carburetor is clogged with
foreign matter.
Throttle operation is inappropriate.
The spark plug is stained or faulty.
The spark plug cap is not properly
connected.
The high-voltage cord or other
cable broke, or its connection is
faulty.
The high-voltage cord or other
cable is grounded.
The ignition coil broke or is faulty.
The piston ring is faulty.
The piston is worn.
A cam is damaged.
The crank gear or cam gear is
damaged.
The valve is damaged.
Carbon accumulated on a valve.
The spark plug is stained or faulty.
The air gap between the magneto
rotor and ignition coil is faulty.
The piston ring is worn.
Carbon accumulated on a sealed
valve surface.
The idling speed is too low.
The carburetor is clogged with
foreign matter.
Cause
-1-
Corrective action
Disassemble the engine and
replace the faulty part.
Replace the faulty part.
Replace the faulty part.
Perform adjustment.
Replenish the fuel tank with
fuel.
Clean or replace the part.
Replace the faulty part.
Clean the part.
Perform appropriate startup
operation.
Clean or replace the part.
Inspect and replace the part.
Repair or replace the part.
Repair the part.
Replace the faulty part.
Remove the foreign matter.
If this problem recurs often,
disassemble the engine and
clean the parts.
Replace the faulty part.
Clean the part.
Clean or replace the part.
Perform adjustment.
Replace the faulty part.
Clean the part.
Perform adjustment.
Disassemble the engine and
clean the part.