Nakayama PB5221, Manual

Page: 21 / 84

EN
21
1. FAILURE TO START
Symptom Possible cause Remedy
Cylinder
compression
pressure normal
Spark
plug spark
normal
Fuel system abnormality There is no fuel in tank fuel filter ob -
structed
Add fuel in tank
Clean fuel filter
Fuel
system
normal
Fuel Fuel is too dirty. There is water in fuel.
There is too much fuel in the cylinder.
Mixture ratio is improper.
Replace the fuel.
Replace the fuel.
Remove the spark plug and dry it.
Mixture proration.
Fuel system
normal
High
voltage
wire spark
normal
Spark plug Spark plug fouled with oily deposits.
Spark plug insulation damage.
Spark gap is too large or small.
Clean the oily deposits.
Replace the spark plug.
Adjust the spark plug gap to 0.6-0.7mm.
High voltage wire spark
abnormality
High voltage wire breach or break off.
Coil looseness
Replace or tighten.
Tighten.
Fuel system normal Ignition
system
normal
Compression pressure is
inadequate
Piston ring attrite
Piston ring is broken
Piston ring cementation
Spark plug looseness.
Conjoint surface of the cylinder and
crank case leak
Replace with a new one
Replace
Eliminate
Tighten
Eliminate
Compression normal High voltage wire and spark plug contact
poor
Stop switch failure or short circuit.
Tighten the spark plug cap.
Repair or replace.
Troubleshooting
2. LOW OUTPUT
Symptom Possible cause Remedy
Flameout when speedup
The smoke is thin, carburretor spout
backward.
Fuel filter obstruct
Fall short of fuel
Muffler fouled with oily deposits
Clean fuel filter, clean fuel road,
adjust carburretor
Compress press is inadequate Piston, piston ring, cylinder attrite Replace piston, piston ring
Engine leak Conjoint surface of the cylinder and crankcase leak Repair
The end of two crank shaft leak The seal is bad Replace seal
Engine overheats
Burning chamber fouled with oily deposits
Avoid using it for a long time, in high
speed and heavy load.
Clean the oily deposits
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