Yamaha YG4000DC Owners Manual - Page 41

TROUBLESHOOTING, Engine won't start

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AE00512 TROUBLESHOOTING Engine won't start 1. Fuel systems No fuel supplied to combustion chamber. 2 No fuel in tank .... Supply fuel. 707-001 2 Clogged fuel line .... Clean fuel line. 2 Foreign matter in fuel cock .... Clean fuel cock. 2 Clogged carburetor .... Clean carburetor. 705-037a 2. Engine oil system Insufficient 2 Oil level is low .... Add engine oil. 700-006 A B 3. Electrical systems 2 Engine switch to "ON". Poor spark 2 Spark plug dirty with carbon or wet .... Remove carbon or wipe spark plug dry. 2 Faulty ignition system .... Consult dealer. 763-127d 4. Compression Insufficient 2 Worn out piston and cylinder .... Consult dealer. 2 Loose cylinder head nuts .... Tighten nuts proper- ly. 2 Damaged gasket .... Replace gasket. 760-009 - 36 -

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36
–
707-001
705-037a
700-006
760-009
AE00512
TROUBLESHOOTING
Engine won’t start
1.
Fuel systems
No fuel supplied to combustion chamber.
2
No fuel in tank
....
Supply fuel.
2
Clogged fuel line
....
Clean fuel line.
2
Foreign matter in fuel cock
....
Clean fuel cock.
2
Clogged carburetor
....
Clean carburetor.
2.
Engine oil system
Insufficient
2
Oil level is low
....
Add engine oil.
3.
Electrical systems
2
Engine switch to
“
ON
”
.
Poor spark
2
Spark plug dirty with carbon or wet
....
Remove
carbon or wipe spark plug dry.
2
Faulty ignition system
....
Consult dealer.
4. Compression
Insufficient
2
Worn out piston and cylinder
....
Consult dealer.
2
Loose cylinder head nuts
....
Tighten nuts proper-
ly.
2
Damaged gasket
....
Replace gasket.
763-127d
A
B