4-3
dummyhead
dummyhead
TROUBLESHOOTING
ENGINE SPEED DOES NOT INCREASE OR STABILIZE
Clogged
Abnormal
Abnormal
Clogged
Air leaking
Compression
is too high
Compression
is too Low
Clean the air cleaner element (page 3-5).
Check for defective valves or valve seats (page
13-9, 13-10).
Check for worn piston, piston rings, or cylinder
inner surface (page 14-9, 14-11).
Check for carbon deposits in the combustion
chamber (page 3-8).
Check around the air intake joint and carburetor;
replace the insulator and/or gasket if necessary.
Disassemble and clean the carburetor (page 6-6,
6-8).
Inspect the spark plug and adjust the spark plug
gap. Replace if necessary (page 3-6).
Adjust the valve clearance (page 3-9).
Clear
Normal
No air leaking
Clean
Adjust the ignition coil air gap (page 9-4).
Abnormal
Adjust or replace the faulty part(s).
Abnormal
Normal
Check the air cleaner element (page 3-5).
Check the spark plug (page 3-6).
Check the valve clearance (page 3-8).
Check the main jet for blockage (page 6-6, 6-7).
Check for secondary air leak.
Check the cylinder compression (page 13-9).
Check the ignition coil air gap (page 9-4).
Check the ignition coil (page 9-5).
Replace the ignition coil if abnormalities are found,
and recheck.
Check that the governor system is installed
correctly (page 7-2, 7-4).
Normal
Normal
Normal
