Troubleshooting Chart - Yamaha DT501988 Owner's Manual

J-504
Troubleshooting chart
U-663
Mit.!d~ 11 MW
Never check the fuel system
while smoking or in the vicinity
~----~
of.an open flame.
CJS-03
1. Fual
Check if there
is fuel in the
fuel tank
2.
Compression
There is
fuel
Some fuel
No fuel
Remove the fuel
cock filter cup
Turn the fuel
cock to "OFF"
Turn the ft..el
cock to "RES"
Supply fuel
Full of fuel
Water or dirt
mixed in fuel
No fuel
Restart engine
Kick the kick lever
to
see if there is
compression
There is compression Compression normal
3. Ignition
Remove plug and
check electrode
No compression Ask Yamaha dealer to inspect
Wipe clean with
dry cloth
Attach plug cap and
ground to chassis
Turn switch
on
and kick strongly
7-36
Check fuel flow
Clean filter cup
Fuel cock clogged
No irregularity up
to fuel cock
Clean fuel cock
Jgnition system normal
Adjust plug gap
or replace plug
Ask Yamaha dealer to inspect