Honda CB1000RA 2019 Manual page 89

Recommended Coolant
Pro Honda HP Coolant is a pre-mixed solution
of antifreeze and distilled water.
Concentration:
50% antifreeze and 50% distilled water
A concentration of antifreeze below 40% will
not provide proper corrosion and cold
temperature protection.
A concentration of up to 60% will provide better
protection in colder climates.
NOTICE
Using coolant not specified for aluminum engines
or tap/mineral water can cause corrosion.
Maintenance Fundamentals
Crankcase Breathers
Service more frequently when riding in rain, at
full throttle, or after the motorcycle 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. P. 113
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