Troubleshooting Chart - Yamaha YFM80WP Owner's Manual

EBU00440

Troubleshooting chart

There is fuel
1. Fuel
Check if there is
fuel in the fuel Some fuel
tank
No fuel
2. Compression
Use electric starter
to see if there is
compression
3. Ignition
Remove plug and
check electrodes
4. Battery
Use electric
starter
Remove the
fuel hose from
the fuel cock.
Turn the fuel
cock to "OFF"
Turn the fuel
cock to "RES"
Supply fuel
There is compresson
No compression
Wipe clean with dry
Wet
cloth
Attach plug cap and
Dry
ground to chassis
Engine turns
Battery good
over quickly
Engine turns Check fluid, recharge,
over slowly check connections
Water or dirt
mixed in fuel
Turn the fuel
Check fuel flow
cock to "ON"
Restart engine
Compression normal
Ask a Yamaha dealer to inspect
Use electric
starter
Ask a Yamaha dealer to inspect
8-73
Clean the fuel filter
and the fuel tank
No fuel
Spark good Ignition system normal
Spark weak
Adjust plug gap or
No spark
replace plug
Fuel cock clogged
Clean fuel cock