Engine Cannot Be Stopped; Lack Of Output Power Or Unstable Revolution - RedMax GZ25N Workshop Manual

8. TROUBLE SHOOTING

8-3 Engine cannot be stopped

Description
Overheating
Switch

8-4 Lack of output power or unstable revolution

Description
Compression is normal 1. Air penetration from fuel pipe joints, etc
and no misfire
Overheating
Others
Note : Hatched columns above are potential failures unique to the stratified scavenging engine.
Cause
1.Lean fuel
2.Cylinder fin clogged with dusts
3.Inproper fuel
4.Carbon deposited inside of combustion Cleaning
chamber
5.Spark plug electrode red hot
1.Faulty switch
2.Cable failure
Cause
2. Air penetration from intake tube joint
or carburetor joint
3 Water in fuel
4. Piston start to seizure
5. Muffler choked with carbon
6. Crack on lead air intake pipe
7. Reed valve clogged with dusts or valve
tip opening is larger than specification
[ 0.2mm (0.008in.) ]
8. Reed valve stuck
1. Fuel too lean
2. Clogging of cylinder fin with dust
3. Poor fuel quality
4. Carbon deposited in the combustion
chamber
5. Spark plug electrode red hot
1. Dirty air cleaner
2. Over loading
22
STRATO CHARGED ENGINE GZ25N
Countermeasure
Adjust carburetor
Cleaning
Change with proper fuel
Clean thoroughly and adjust
spark gap
[ 0.6-0.7mm (0.023-0.028in.) ]
Exchange
Repair
Countermeasure
Secure connection
Change gasket or tightening
screws
Change with good fuel
Filing of seized surface with fine files
Cleaning
Exchange
Cleaning or exchange
components
Cleaning or exchange
Adjust carburetor
Cleaning
Exchange with proper fuel
Cleaning
Thoroughly clean, adjust spark
gap
[ 0.6-0.7mm (0.023-0.028in.) ]
Wash with mixed gasoline
Reduce load