Honda GX120K1 Manual page 45

GX120K1•GX160K1•GX200
ENGINE CRANKS BUT WON'T START
• Check the oil level before troubleshooting
Loosen the carburetor drain screw and
check the fuel flow from the fuel tank
(P. 6-4).
Fuel
Perform the spark test (P. 2-19).
Spark
Check the cylinder compression
(P. 2-19).
Normal
Check the spark plug (P. 3-9).
Dry
Disassemble the carburetor to clean the
carburetor ports, jets, and nozzles
(P. 6-8).
Check for a restricted spark arrester
(applicable types) (P. 3-11).
gx120k1_gx160k1_gx200
(P. 3-3).
No fuel
No spark
Compression
too high
Compression
too low
Wet
SERVICE INFORMATION
Check for clogged fuel filter, fuel tank
joint, fuel tube, or cup filter (P.
Perform the NO OR WEAK SPARK AT
SPARKPLUG TROUBLESHOOTING
P. 2-18.
Check the valve clearance (P.
then perform the cylinder compression
test. If the cylinder compression is too
high, remove carbon deposits in the
combustion chamber (P. 9-4).
Check the valve clearance (P.
then perform the cylinder compression
test. If the cylinder compression is too
low, perform a leak down test. If there is
no air leakage in the engine, check the
following.
-Valve spring free length (P. 9-4)
-Valve seat width (P. 9-4)
-Valve face irregularly worn
-Piston ring side clearance (P. 10-7)
-Piston ring width (P. 10-7)
-Piston ring end gap (P. 10-8)
-Piston skirt O.D. (P. 10-7)
-Cylinder sleeve I.D. (P. 10-6)
If the 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 (P. 6-4).
7-1).
3-8),and
3-8), and
2-13