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TROUBLESHOOTING
ENGINE SPEED IS UNEVEN
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 if the fuel tank cap (canister) is clogged. Clean or replace.
4 Check if the fuel cock is clogged. Clean.
5 Check the spark plug for dirt and check the spark plug gap. Clean, adjust, or replace the spark plug.
6 Check the carburetor pilot screw turn out and float height. Adjust or replace.
7
Check if there is air suction from the carburetor joint, gas-
ket, or throttle shaft.
• Tighten the carburetor nuts securely.
• Replace the carburetor joint or gasket
with a new one.
8
Check if the slow or main passages such as, pilot jet and
main jet, in the carburetor are clogged.
Clean the parts.
9
Check the valve clearance.
(Refer to “ADJUSTING THE VALVE CLEARANCE” on
page 2-11)
Adjust the valve clearance.
10
Check the valve face and valve seat for wear.
(Refer to “VALVE” on page 3-26)
Resurface or replace the valve face and
valve seat.
11
Check if there is seizure, wear, or damage on the piston,
piston ring, or cylinder.
(Refer to “PISTON, CAMSHAFT, CRANKCASE, AND
CRANKSHAFT” on page 3-32)
Rebore or replace.
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