Spark Arrester Cleaning - Yamaha Big Bear YFM400R Owner's Manual

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.
8-17