Yamaha F30A Service Manual page 270

TRBL
SHTG
Symptom 1: Unstable engine idle speed, poor acceleration, poor performance, limited
engine speed, or engine stalls
Symptom 2
Intermittent spark
Incorrect fuel and
air amount supplied
WD: See the wiring diagram.
9-5
Troubleshooting
Cause 1
Spark plug malfunc-
tion
Spark plug cap mal-
function
Ignition coil mal-
function
Engine shut-off
switch malfunction
Charge coil mal-
function
Pulser coil malfunc-
tion
Short or open con-
nection in ignition
circuit
CDI unit malfunc-
tion
Pinched or kinked
fuel hose
Clogged fuel filter
Fuel pump malfunc-
tion
Carburetor malfunc-
tion
Cause 2
—
—
—
—
—
—
—
—
—
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Carburetors not
synchronized
Throttle stop screw
not adjusted cor-
rectly
Pilot screw not
adjusted correctly
Malfunction of the
carburetor internal
parts
Prime Start system
malfunction
Checking step
Check the spark
plug.
Check the spark
plug cap.
Check the ignition
coil.
Check the engine
shut-off switch.
Check the charge
coil.
Check the pulser
coil.
Check the wiring
harness continuity.
Check the CDI unit.
Check the fuel
hoses and fuel hose
joint.
Replace the fuel fil-
ter.
Disassemble and
check the fuel
pump.
Synchronize the
carburetors.
Adjust the throttle
stop screw.
Adjust the pilot
screw.
Disassemble and
check the carbure-
tor.
Check the Prime
Start system
Refer
to
page
3-6
8-16
8-16
8-18
8-19
8-17
8-17
WD
8-19
3-3
3-3
4-4
4-17
3-11
4-15
4-12
4-13
67C3K11