Ignition System - Honda GXR120T Manual

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TROUBLESHOOTING
BEFORE TROUBLESHOOTING
TROUBLESHOOTING
• Check that the electrical connectors are connected securely.
• Check for sufficient fresh fuel in the fuel tank.
• Read the circuit tester's operation instructions carefully, and observe the instructions during inspection.
TROUBLESHOOTING
ENGINE DOES NOT CRANK
Remove the recoil starter (page 10-2) and check
whether the engine cranks (turns over).
Cranks
Inspect the recoil starter (page 10-6).
ENGINE CRANKS BUT WON'T START
• Check the oil level before troubleshooting (page 3-3).
Turn the fuel valve lever to the ON position.
Loosen the carburetor drain screw and check the
fuel flow from the fuel tank (Applicable types).
Flows
Perform the spark test (page 9-4).
Spark
Check the cylinder compression (page 13-9).
Normal
Check the spark plug (page 3-6).
Dry
Disassemble the carburetor to clean the carburetor
ports, jets, and nozzles (page 6-6).
4-2
Cannot be cranked
Disassemble the engine and replace the faulty
part(s) (page 14-4).
Abnormal
Replace the faulty part(s).
Does not flow
Check for clogged fuel filter, fuel tank joint, and fuel
tube.
No spark
Perform the IGNITION SYSTEM
TROUBLESHOOTING (page 9-2).
Compression
is too high
Check the valve clearance (page 3-8), and then
perform the cylinder compression test. If the
cylinder compression is too high, remove carbon
deposits in the combustion chamber (page 3-8).
Check the decompressor operation of the
camshaft (page 13-6).
Check the valve clearance (page 3-8), and then
perform the cylinder compression test.
If the cylinder compression is too low, perform a
leak down test.
Compression
If there is no air leakage in the engine, check the
is too low
following.
- Valve spring free length (page 13-11)
- Valve seat width (page 13-9)
- Decompressor operation (page 13-6)
- Piston ring side clearance (page 14-10)
- Piston ring width (page 14-11)
- Piston ring end gap (page 14-11)
- Piston skirt O.D. (page 14-9)
- Cylinder sleeve I.D. (page 14-9)
Wet
If spark plug is correct, clean and dry the
electrodes and then restart the engine, taking care
that the choke valve is not closed too much.
If the engine does not start and the electrodes are
wet again, check the carburetor float valve (page
6-7).