Troubleshooting - Nakayama PB5221 Manual

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Troubleshooting

1. FAILURE TO START
Symptom
Cylinder Spark
compression plug spark
pressure normal normal
Fuel system
normal
Fuel system normal Ignition
system
normal
2. LOW OUTPUT
Symptom
Flameout when speedup
The smoke is thin, carburretor spout
backward.
Compress press is inadequate
Engine leak
The end of two crank shaft leak
12
Possible cause
Fuel system abnormality There is no fuel in tank fuel filter ob-
structed
Fuel Fuel Fuel is too dirty. There is water in fuel.
system There is too much fuel in the cylinder.
normal Mixture ratio is improper.
High Spark plug Spark plug fouled with oily deposits.
voltage Spark plug insulation damage.
wire spark Spark gap is too large or small.
normal
High voltage wire spark High voltage wire breach or break off.
abnormality Coil looseness
Compression pressure is Piston ring attrite
inadequate Piston ring is broken
Piston ring cementation
Spark plug looseness.
Conjoint surface of the cylinder and
crank case leak
Compression normal High voltage wire and spark plug contact
poor
Stop switch failure or short circuit.
Possible cause
Fuel filter obstruct
Fall short of fuel
Muffler fouled with oily deposits
Piston, piston ring, cylinder attrite
Conjoint surface of the cylinder and crankcase leak
The seal is bad
Engine overheats
Burning chamber fouled with oily deposits
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Remedy
Add fuel in tank
Clean fuel filter
Replace the fuel.
Replace the fuel.
Remove the spark plug and dry it.
Mixture proration.
Clean the oily deposits.
Replace the spark plug.
Adjust the spark plug gap to 0.6-0.7mm.
Replace or tighten.
Tighten.
Replace with a new one
Replace
Eliminate
Tighten
Eliminate
Tighten the spark plug cap.
Repair or replace.
Remedy
Clean fuel filter, clean fuel road,
adjust carburretor
Replace piston, piston ring
Repair
Replace seal
Avoid using it for a long time, in high
speed and heavy load.
Clean the oily deposits