TOHATSU NB-1000 Service Manual page 54

Checks
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
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
1-/ 2-Cylinder
Symptom
OIL MIXTURE
CARBURETOR
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RECIRCULATION SYSTEM
FUEL PUMP
INLET MANIFOLD
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FUEL SYSTEM
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