Poor Medium And High Speed Performance; Poor Speed Performance - Yamaha SR125 1997 Service Manual

POOR MEDIUM AND HIGH SPEED PERFORMANCE

EB902000
POOR MEDIUM AND HIGH SPEED PERFORMANCE
POOR MEDIUM AND HIGH SPEED PERFORMANCE
Refer to "STARTING FAILURE/HARD STARTING" section. (Fuel system, electrical system, compres-
sion system and valve train)
Carburetor
: Improperly adjusted fuel level
: Clogged main nozzle
: Clogged or loose pilot jet
SR******

POOR SPEED PERFORMANCE

POOR SPEED PERFORMANCE
Ignition system
: Dirty spark plug
: Improper heat range
: Faulty C.D.I. unit
: Faulty pick up coil
Fuel system
: Clogged fuel tank cap breather hole
: Clogged air cleaner element
: Clogged jet
: Improperly adjusted fuel level
Air filter
: Clogged air filter element
Compression system
: Worn cylinder
: Worn or seized piston ring
: Cylinder head gasket broken
: Cylinder gasket broken
: Carbon deposit build-up
: Improperly adjusted valve clearance
: Improperly contacted valve and valve seat
: Faulty valve timing
Clutch
: Refer to "CLUTCH SLIPPING/DRAGGING"
section
Engine oil
: Improper oil level (low or over oil level)
: Improper quality (Low oil viscosity)
: Deterioration
: Clogged oil passage
Brakes
: Dragging brake
8-3
TRBL
SHTG