spark plugs replace YAMAHA YBR125 2003 Owners Manual

6-37Never check the fuel system while smoking or in the
vicinity of an open flame.
Check if there is
fuel in the fuel tank
Use electric
starter
Remove spark
plug and check
electrode
Use electric starter 1. Fuel
2. Compression
3. Ignition
4. BatteryEnough fuel
No fuel
There is compression
No compression
Wet
Dry
Engine turns
over quickly
Engine turns
over slowlySupply fuel
Go to ignition check
Ask Yamaha dealer to inspect
Wipe clean with dry cloth and correct
spark plug gap or replace spark plugs
Ask Yamaha dealer to inspect
Battery good
Check fluid,
recharge and check
connections
Troubleshooting chart
Go to compression
check
Engine doesn’t start, go
to compression check
Open the throttle hal-way
and start the engine
Engine doesn’t start, ask
Yamaha dealer to inspect.Engine doesn’t start,
go to battery check
WARNING:
6-37Never check the fuel system while smoking or in the
vicinity of an open flame.
Check if there is
fuel in the fuel tank
Use electric
starter
Remove spark
plug and check
electrode
Use electric starter 1. Fuel
2. Compression
3. Ignition
4. BatteryEnough fuel
No fuel
There is compression
No compression
Wet
Dry
Engine turns
over quickly
Engine turns
over slowlySupply fuel
Go to ignition check
Ask Yamaha dealer to inspect
Wipe clean with dry cloth and correct
spark plug gap or replace spark plugs
Ask Yamaha dealer to inspect
Battery good
Check fluid,
recharge and check
connections
Troubleshooting chart
Go to compression
check
Engine doesn’t start, go
to compression check
Open the throttle hal-way
and start the engine
Engine doesn’t start, ask
Yamaha dealer to inspect.Engine doesn’t start,
go to battery check
WARNING: