Yamaha PW50W 2007 Service Manual page 161

GENERAL INFORMATION/STARTING FAILURES
EAS28450
EAS28460
GENERAL INFORMATION
NOTE:
The following guide for troubleshooting does not cover all the possible causes of trouble. It should
be helpful, however, as a guide to basic troubleshooting. Refer to the relative procedure in this
manual for checks, adjustments, and replacement of parts.
EAS28470
STARTING FAILURES
ENGINE
Cylinder(s) and cylinder head(s)
9 Loose spark plug
9 Loose cylinder head or cylinder
9 Damaged cylinder head gasket
9 Damaged cylinder gasket
9 Worn or damaged cylinder
Piston(s) and piston ring(s)
9 Improperly installed piston ring
9 Damaged, worn or fatigued piston ring
9 Seized piston ring
9 Seized or damaged piston
Air filter
9 Improperly installed air filter
9 Clogged air filter element
Crankcase and crankshaft
9 Improperly assembled crankcase
9 Seized crankshaft
Reed valve
9 Deformed reed valve stopper
9 Improperly sealed reed valve stopper
9 Incorrect tightened manifold
9 Damaged gasket
9 Damaged reed valve
TROUBLESHOOTING
FUEL SYSTEM
Fuel tank
9 Empty fuel tank
9 Deteriorated or contaminated fuel
Fuel cock
9 Clogged or damaged fuel hose
Carburetor(s)
9 Improperly adjusted throttle stop screw
9 Deteriorated or contaminated fuel
9 Clogged pilot jet
9 Clogged pilot air passage
9 Sucked-in air
9 Damaged float
9 Worn needle valve
9 Improperly installed needle valve seat
9 Incorrect fuel level
9 Improperly installed pilot jet
9 Clogged starter jet
9 Faulty starter plunger
9 Improperly adjusted starter cable
8-1
TRBL
SHTG