Honda 954 Service Manual page 492

I
Check for engine overheating
12.
I
Not overheating
I
I
I
Accelerate or run at high speed
13.
Engine does not knock
POOR PERFORMANCE AT LOW AND IDLE SPEED
Check ignition timing
1.
I
Correct
Check the starter valve synchronization
2.
I
Correct
Inspect the fuel flow
3.
l
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Normal
Inspect the fuel injector
4.
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Normal
1
Check for leaks in the intake pipe
5.
I
Not leak
Perform spark test
6.
Good spark
Overheating
Engine knocks
Incorrect
Incorrect
Abnormal
Abnormal
Leaking
Weak or intermittent
spark
TROUBLESHOOTING
Possible cause
Coolant level low
Fan motor not working (faulty fan
motor switch)
Thermostat stuck close
Excessive carbon build-up in com-
bustion chamber
Use of poor quality fuel
Wrong type of fuel
Clutch slipping
Worn piston and cylinder
Wrong type of fuel
Excessive carbon build-up in com-
bustion chamber
Ignition timing to advanced (faulty
Lean fuel mixture
Possible cause
Improper ignition timing
.
See section 5
Faulty pressure regulator (Section 5)
See section 5
Loose insulator clamp
Damaged insulator
Faulty spark plug
Faulty carbon or wet fouled spark
Faulty ECM
Faulty ignition coil
Broken or shorted spark plug wire
Faulty engine stop switch
Faulty ignition pulse generator
Faulty ignition switch
Loose or disconnected ignition sys-
tem wires
21-3