8-31
NOTE:
The air filter element should be wet but not dripping.8. Install the air filter element, the air filter
case cover and the front cover.NOTE:
The air filter element should be cleaned every
20 – 40 hours. It should be cleaned and lubri-
cated more often if the machine is operated in
extremely dusty areas. Each time air filter ele-
ment maintenance is performed, check the air
inlet of the air filter case for obstructions. Check
the air cleaner rubber joint to the carburetor and
manifold fittings for an air-tight seal. Tighten all
fittings securely to avoid the possibility of unfil-
tered air entering the engine.cCNever operate the engine with the air filter
element removed. This will allow unfiltered
air to enter, causing rapid engine wear and
possible engine damage. Additionally, opera-
tion without the filter element will affect car-
buretor jetting with subsequent poor perfor-
mance and possible engine overheating.
5TH-9-60 8 9/25/01 5:50 PM Page 8-31
EBU00440Troubleshooting chart1. FuelCheck if there is
fuel in the fuel
tank2. CompressionUse electric starter
to see if there is
compression3. IgnitionRemove plug and
check electrodes
Wet
Wipe clean with dry
cloth
Dry
Attach plug cap and
ground to chassis
Use electric
starter
Spark weakSpark good
Ignition system normal
No spark
Ask a Yamaha dealer to inspect
Adjust plug gap or
replace plug
There is compresson
Compression normalAsk a Yamaha dealer to inspect
No compression
There is fuel
Turn the fuel
cock to “OFF”Remove the
fuel hose from
the fuel cock.
Some fuel
Turn the fuel
cock to “RES”
Restart engine
No fuel
Supply fuel
4. BatteryUse electric
starter
Engine turns
over quickly
Battery good
Engine turns
over slowly
Check fluid, recharge,
check connections
Check fuel flow
Water or dirt
mixed in fuelTurn the fuel
cock to “ON”
No fuel
Fuel cock clogged
Clean the fuel filter
and the fuel tank
Clean fuel cock
8-73
5TH-9-60 8 9/25/01 5:50 PM Page 8-73
