Honda CRF450X 2021 Manual page 37

Refueling
Breather tube
Lower edge of
filler neck
Be careful not to damage the fuel pump
while filling the fuel tank.
Do not fill with fuel above the lower edge of
the filler neck.
34
Fuel fill cap
Fuel type: Unleaded gasoline only
Recommended fuel octane number:
Pump Octane Number (PON) 91 or higher.
Tank capacity: 2.01 US gal (7.6 L)
#
Refueling and Fuel Guidelines
(P.11)