Yamaha BIG BEAR YFM400S Owner's Manual download pdf (Page 149)

8-40

EBU00440

Troubleshooting chart

1. Fuel

Check if there is fuel

in the fuel tank.

There is fuel.

Turn the fuel

cock to “OFF”.

Remove the fuel pipe.

Fuel cock

clogged.

Clean fuel

cock.

Some fuel.

Turn the fuel

cock to “RES”.

Restart engine.

No fuel.

Supply fuel.

2. Compression

Use the electric starter

to see if there is

compression.

There is compression.

No compression.

3. Ignition

Remove the plug and

check the electrodes.

Wet

Wipe clean with

dry cloth.

Dry

Attach plug cap and

ground to chassis.

Use the

electric starter.

Spark good.

Ignition system

normal.

Spark weak.

Adjust plug gap

or replace plug.

No spark.

Ask a Yamaha dealer to inspect.

4. Battery

Use the electric starter.

Engine turns over

quickly.

Battery good.

Engine turns over

slowly.

Check fuel

flow.

Turn the fuel

cock to “ON”.

Compression normal.

Ask a Yamaha dealer to inspect.

Recharge, check

connections.

No fuel.

U5GW13.book Page 40 Tuesday, July 30, 2002 2:23 PM

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Yamaha BIG BEAR YFM400S Owner's Manual Page 149

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