TOHATSU MFS 2 Service Manual

9-2
Troubleshooting
O K
4st 2/2.5/3.5 2007
1.Troubleshooting List
○○ Fuel level is low in the tank.
○○○○ ○○○ Fuel system connection is incomplete.
○○○○ ○○○ Fuel pipe is twisted.
○○○○ ○○○ Air vent screw is closed.
○○○○ ○○○ Fuel cock or carburetor is clogged.
○○○○ ○○○ Low quality gasoline
○○○○ Fuel is fed excessively.
○○○○ ○○○ Carburetor is maintained poorly.
○○ ○○○ Engine oil is deteriorated.
○○ ○○ Engine oil level is too high.
○○Engine oil lacks.
○○○○ ○○○ Use of spark plugs not specified
○○○○ ○○ Spark plug carbon deposit or bridge
○○○○ ○○ No sparks or weak spark
○ Stop switch short-circuited
○ Stop switch lock is not in place.
○○○○ ○○ Ignition timing is not properly adjusted.
○○○○ ○○ Valve timing is wrong.
○○○○ ○○ Valve clearance is wrong.
○○○○ ○○ Valve seat sealing is defective.
○○○○ ○○ Piston, piston ring and/or cylinder is worn excessively.
○○Combustion chamber excessive carbon deposits.
○○ ○○ Spark plug is loose.
○○○(Cooling water is lacking.) Water pump is defective or clogged.
○○○Thermostat operation is defective.
○○ ○○ Anti-cavitation plate is damaged.
○○○○○ Use of mismatched propeller.
○○○○○○ Propeller is damaged or deformed.
○○○○○ Thrust rod position is not correct.
○○○○○ Boat is unbalanced by load position.
○○○○○ Transom installation height is too high or too low.
○○○○ ○○ Throttle link adjustment is defective.
Engine will not start.
Fuel & Lubrication System Ignition System Compression Others
Engine stalls immediately
after starting.
Idles abnormally.
Defective acceleration.
Engine speed is very high causing
high speed ESG to operate.
Boat cannot run at high
speed.
Engine speed is low.
Engine overheats.
Probable Cause
MFS2sec09070524.qxd07.5.243:23 PM  ページ2

TOHATSU MFS 2 Specifications

General

Brand	TOHATSU
Model	MFS 2
Category	Engine
Language	English