Poor Idle Speed Performance; Poor Midium And High Speed Performance - Yamaha YW50AP Service Manual

POOR MIDIUM AND HIGH SPEED PERFORMANCE

POOR IDLE SPEED PERFORMANCE

POOR IDLE SPEED PERFORMANCE
Carburetor
Auto choke
Air cleaner
Ignition system
POOR MEDIUM AND HIGH SPEED
PERFORMANCE
POOR MEDIUM AND HIGH SPEED PERFOR-
MANCE
Carburetor
Air cleaner
Muffler
POOR IDLE SPEED PERFORMANCE
8-3
PROBABLE CAUSE
8 Improperly returned starter plunger
8 Clogged or loose pilot jet
8 Clogged pilot air jet
8 Improperly adjusted idle speed
(Throttle stop screw)
8 Improper throttle cable play
8 Flooded carburetor
8 Starter plunger malfunction
8 Wax malfunction
8 Faulty thermister
8 Clogged air cleaner
8 Faulty spark plug
8 Faulty spark plug read
8 Faulty C.D.I. unit
8 Faulty source coil
8 Faulty ignition coil
PROBABLE CAUSE
8 Refer to starting failure/Hard starting item
(Fuel system, Ignition system, compression
system)
8 Clogged or loose main nozzle
8 Clogged or loose main jet
8 Improperly adjust fuel level
8 Sucked-in air
8 Clogged air filter
8 Clogged
TRBL
SHTG