6-4
1
2
3
4
5
6
7
8
9
10
TR
OUBLESH
OO
TIN
G
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.
Summary of Contents for MX250
Page 2: ...7VE F8197 10_Cover indd 2 2017 03 16 16 24 50 ...
Page 86: ...5 1 1 2 3 4 5 6 7 8 9 10 ELECTRICAL ELECTRICAL CIRCUIT DIAGRAM B B B B B B B B W Y 1 2 3 4 5 ...
Page 100: ...6 6 1 2 3 4 5 6 7 8 9 10 TROUBLESHOOTING GOVERNOR OPERATION MEMO ...
Page 116: ...7 16 1 2 3 4 5 6 7 8 9 10 SPECIFICATIONS WIRE ROUTING DIAGRAM TCI UNIT ...
Page 120: ...APPENDIX CIRCUIT DIAGRAM B B B B B B B B W Y 1 2 3 4 5 ...
Page 122: ...MEMO ...
Page 123: ...7VE F8197 10_Cover indd 2 2017 03 16 16 24 50 ...
