Baja Motorsports WD400-U Operator's Manual - Manual (Page 71)

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WARNING
Running the engine indoors or in a garage could be hazardous.
Exhaust gas contains carbon monoxide that is colorless and
odorless. It could cause serious injury or death.
Only run the engine outdoors where there is fresh air.
WARNING
The hot exhaust muffler could burn you.
The muffler will be hot enough to burn you after stopping the engine.
Wait until the exhaust muffler cools to remove it.
WARNING
Riding an ATV with improperly tightened drain bolt could be
hazardous.
Running the engine with a loose drain bolt or without a drain bolt
will let hot carbon particles to escape. This can cause a fire.
Tighten the drain bolt securely.