Honda CRF1100A 2021 Owner's Manual page 276

Maintenance Fundamentals
III IN, II FO, III FO, II MA, III MA type
Use only genuine HONDA PRE-MIX COOLANT
without diluting with water. Genuine HONDA
PRE-MIX COOLANT is excellent at preventing
corrosion and overheating.
The coolant should be inspected and replaced
properly by following the maintenance schedule.
P. 257
2
NOTICE
Using coolant not specified for aluminium engines or tap/
mineral water can cause corrosion.
270
Crankcase Breathers
Service more frequently when riding in rain, at
full throttle, or after the vehicle is washed or
overturned. Service if the deposit level can be
seen in the transparent section of the drain tube.
If the drain tube overflows, the air filter may
become contaminated with engine oil causing
poor engine performance.
Tyres (Inspecting/Replacing)
#
Checking the Air Pressure
Visually inspect your tyres and use an air pressure
gauge to measure the air pressure before each off-
road ride and whenever you return to pavement
after riding off-road. If you only ride on pavement,
check the pressure at least once a month or any
time you think the tyres look low. Always check air
pressure when your tyres are cold.