Yamaha F30A Service Manual page 269

Symptom 2
Fuel not supplied
Low compression
pressure
67C3K11
Cause 1
Pinched or kinked
fuel hose
Clogged fuel filter
Fuel pump malfunc-
tion
Carburetor malfunc- Malfunction of the
tion carburetor internal
parts
Valve clearance not
adjusted correctly
Damaged cylinder
head gasket
Damaged valve
Valve stuck to valve
guide
Scratched piston or
cylinder
Damaged or worn
piston ring
Troubleshooting the outboard motor
Cause 2 Checking step
Check the fuel
— hoses and fuel hose
joint.
Replace the fuel fil-
—
ter.
Disassemble and
— check the fuel
pump.
Disassemble and
check the carbure-
tor.
Adjust the valve
—
clearance.
Disassemble and
check the cylinder
head and power
unit.
—
Refer
to
page
1
3-3
3-3
2
4-4
4-12
3
5-2
4
5-29
5-42
5
6
7
8
9
9-4