RedMax GZ25N - 8-2 Stalled during Operation; 8-3 Engine cannot be stopped; 8-4 Lack of output power or unstable revolution

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STRATO CHARGED ENGINE  GZ25N
8. TROUBLE SHOOTING
8-3 Engine cannot be stopped
8-4 Lack of output power or unstable revolution
Description Cause Countermeasure
Overheating 1.Lean fuel Adjust carburetor
2.Cylinder fin clogged with dusts Cleaning
3.Inproper fuel Change with proper fuel
4.Carbon deposited inside of combustion Cleaning
chamber
5.Spark plug electrode red hot Clean thoroughly and adjust
spark gap
[ 0.6-0.7mm (0.023-0.028in.) ]
Switch 1.Faulty switch Exchange
2.Cable failure Repair
Description Cause Countermeasure
Compression is normal
1. Air penetration from fuel pipe joints, etc Secure connection
2. Air penetration from intake tube joint Change gasket or tightening
or carburetor joint screws
3 Water in fuel Change with good fuel
4. Piston start to seizure
Filing of seized surface with fine files
5. Muffler choked with carbon Cleaning
6. Crack on lead air intake pipe Exchange
7. Reed valve clogged with dusts or valve
Cleaning or exchange
tip opening is larger than specification
components
[ 0.2mm (0.008in.) ]
8. Reed valve stuck Cleaning or exchange
Overheating 1. Fuel too lean Adjust carburetor
2. Clogging of cylinder fin with dust Cleaning
3. Poor fuel quality Exchange with proper fuel
4. Carbon deposited in the combustion Cleaning
chamber
5. Spark plug electrode red hot Thoroughly clean, adjust spark
gap
[ 0.6-0.7mm (0.023-0.028in.) ]
Others 1. Dirty air cleaner Wash with mixed gasoline
2. Over loading Reduce load
and no misfire
Note : Hatched columns above are potential failures unique to the stratified scavenging engine.