Yamaha BIG BEAR YFM400S Owner's Manual download pdf (Page 126)

8-17

EBU00754

Spark arrester cleaning

Select a well-ventilated area free of combusti-

ble materials and make sure the exhaust pipe

and muffler are cool.

1. Remove the purging bolt.

1. Purging bolt

2. Start the engine and rev it up approxi-

mately twenty times while momentarily

creating exhaust system back pressure

by blocking the end of the muffler with a

shop towel.

3. Stop the engine and allow the exhaust

pipe to cool.

4. Install the purging bolt and tighten it.

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Yamaha BIG BEAR YFM400S Owner's Manual Page 126