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707-7XFc
705-073
ON
OFF
q
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 Fuel in tank .... Fuel cock knob to “ON” 1.
2 Clogged fuel line .... Clean fuel line.
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 “START” 1.
Poor spark
2 Spark plug dirty with carbon or wet .... Remove
carbon or wipe spark plug dry.
2 Faulty ignition system .... Consult a Yamaha deal-
er.
4. Compression
Insufficient
2 Worn out piston and cylinder .... Consult a
Yamaha dealer.
2 Loose cylinder head nuts .... Tighten nuts proper-
ly.
2 Damaged gasket .... Replace gasket.
763-120a
q
7CK-28199-10_b 08.9.15 17:13 Page 42