Honda CRF1100A 2021 Owner's Manual page 12

Safety Guidelines
Carbon Monoxide Hazard
Exhaust contains poisonous carbon monoxide, a
colourless, odorless gas. Breathing carbon
monoxide can cause loss of consciousness and
may lead to death.
If you run the engine in confined or even partly
enclosed area, the air you breathe could contain
a dangerous amount of carbon monoxide.
Never run your vehicle inside a garage or other
enclosure.
6
WARNING
3
Running the engine of your vehicle while
in an enclosed or even partially enclosed
area can cause a rapid build-up of toxic
carbon monoxide gas.
Breathing this colourless, odorless gas
can quickly cause unconsciousness and
lead to death.
Only run your vehicle's engine when it is
located in a well ventilated area
outdoors.