Honda NSS250A Owner's Manual page 113

Coolant
Decreasing the concentration of antifreeze
to less than 40% will not provide proper
corrosion protection.
Increasing the concentration of antifreeze
is not recommended because it decreases
cooling system performance. Higher
concentrations of antifreeze (up to 60%)
should only be used to provide additional
protection against freezing. Check the
cooling system frequently during freezing
weather.
104
Servicing Your Honda
Checking & Adding Coolant
Refer to Saf ety Precautions
FRONT
(1) fuel tank lid
1. Open the fuel tank lid ( ) (page
on page 72 .
(1)
1 91 ).