TOHATSU 40 Service Manual page 55

Checks
No oil in engine oil tank
Mixture too rich (too much oil)
Mixture too lean (not enough oil)
Carburetor out of adjustment
Carburetor obstruction or faulty needle
valve
Restricted air flow to carburetor
Faulty choke valve
Carburetor and ignition timing not
synchronized
Carburetors not synchronized
Float position too high
Float position too low
Jet obstructed or defective
Carburetor gasket leakage
Puddle drain valve or hose blockage
Recirculation hose misrouted
Mounting gasket leakage
Check valve sticking open or closed
Ruptured diaphragm
Warped inlet manifold
Manifold gasket leakage
Faulty reed valve operation or broken
valve
Reed valve gasket leakage
3-/ 4-Cylinder
Symptom
OIL MIXTURE
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CARBURETOR
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RECIRCULATION SYSTEM
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FUEL PUMP
INLET MANIFOLD
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FUEL SYSTEM
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