6-5
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TROUBLESHOOTING
OTHER TROUBLES
ENGINE SPEED IS UNEVEN
No. Checking steps Possible remedy
1 Check the fuel level. Add the fuel if it is insufficient.
2 Check if fuel has deteriorated. Replace the fuel.
3
Check the spark plugs for dirt and check the spark plug
gap.
Clean, adjust, or replace the spark
plugs.
4
Check if there is air suction from the carburetor assembly
joint, gasket, or throttle shaft.
• Tighten the carburetor assembly nuts
securely.
• Replace the carburetor assembly joint
or gasket with a new one.
5
Check if the main passages, such as the carburetor assem-
bly, are clogged.
Clean the parts.
6
Check the valve clearance.
(Refer to “ADJUSTING THE VALVE CLEARANCE” on
page 2-9)
Adjust the valve clearance.
7
Check the valve face and valve seat for wear.
(Refer to “VALVES” on page 3-26)
Resurface or replace the valve face and
valve seat.
8
Check if there is seizure, wear, or damage on the piston,
piston ring, or cylinder.
(Refer to “PISTONS, CAMSHAFT, CRANKCASE, AND
CRANKSHAFT” on page 3-37)
Rebore or replace the piston, piston ring
or cylinder.
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