Starting Failures; Improper Engine Idling - Yamaha FZ-16 Service Manual

TROUBLESHOOTING
GENERAL INFORMATION
NOTE:
The following guide for troubleshooting does not
cover all possible causes. It should be useful,
however, as a basic guide to the
troubleshooting. See the procedure
this time on manual checks,
adjustments and parts replacement.

STARTING FAILURES

Engine
1. Cylinder and cylinder head
•
Loose spark plug
•
Cylinder head or loose
•
Damage to the cylinder head gasket
•
Damaged cylinder gasket
•
Worn or damaged cylinder
•
Bad valve lash adjustment
•
Valve not closed
•
Improper seating of the valve
•
Improper synchronism valve
•
Defective valve spring
•
Stiff valve
2. Piston and piston rings
•
Improperly installed piston rings
•
Damage, wear or fatigue on the piston rings
•
Knotted rings
•
Damaged or seized piston
3. Air filter
•
Improperly installed air filter
•
Air filter element clogged
4. Crankcase and crankshaft
•
Incorrect assembly of the housing
•
Stiff crankshaft
Fuel System
1. Fuel tank
•
Empty fuel tank
•
Fuel filter clogging
•
Deteriorated or contaminated fuel
2. Carburetor
•
Deteriorated or contaminated fuel
•
Clogged fuel pump
•
Carburetor out of adjustment
TROUBLESHOOTING
Electrical System
1. Battery
•
Discharged battery
•
Battery failure
2. Fuse
•
Fuse, damaged or incorrect
•
Fuse improperly installed
3. Plug
•
Incorrect spark plug cap
•
Heat range spark plug incorrect
•
Spark plug faulty
•
Worn or damaged electrode
•
Worn or damaged insulation
•
Faulty spark plug cap
4. Ignition coil
•
Body of the ignition coil with cracks
or fractured
•
Primary or secondary coils fractured or
•
short circuit
Faulty spark plug wire
Ystem 5.S Power
•
Defective CDI
•
Crankshaft position sensor faulty
•
Rotor magnet or pin broken
6. Switches and wiring
•
Switches and wiring
•
Main switch defective
•
Engine stop switch defective
•
Broken or shorted wiring
Neutral switch defective
•
Starter switch defective
•
Defective clutch switch
•
Grounding the circuit
•
Loose
7. Starting System
•
Starter defective
•
Start relay defective
•
Cut-off relay defective ignition
•
Faulty starter clutch

Improper engine idling

1. Cylinder and cylinder head
•
Bad valve lash adjustment
•
Valve train components damaged
2. Air filter
•
Air filter element clogged
Fuel System
1.Carburador
•
Union carburetor loose or damaged
•
Free game accelerator cable inappropriate
•
Flooded carburetor
•
Air Induction System defective
8.1