TOHATSU 2 Stroke Cylinder Series, Service Manual

Page: 54 / 268

FUEL SYSTEM
3-7
1-/ 2-Cylinder
Checks
Symptom
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
OIL MIXTURE
Har
d to start or
will not start Misses at low speed
Excessive fuel consumption
Misses at high speed
Poor acceleration, hesitation or coughs Runs r
ough
and smokes Idles well, then slows and stops Will not start and after fir
es
into exhaust housing No acceleration, low/full thr
ottle RPM
Idles well but slows when accelerated Runs at high speed only when hand primer is used Engine stops suddenly
Runs noisy and knocks
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
CARBURETOR
RECIRCULATION SYSTEM
FUEL PUMP
INLET MANIFOLD
•
•
•
•
•
•
•
•
•
•