Honda WT20X Manuel De L'utilisateur page 17

With the engine stopped and on a level surface, remove the fuel tank
cap and check the fuel level.
Refill the tank if the fuel level is low.
Do not fill the fuel tank completely. Fill tank to approximately 25 mm (1
inch) below the top of the fuel tank to allow for fuel expansion. If may
be necessary to lower the fuel level depending on operating
conditions.
After refueling, make sure the tank cap is closed properly and securely.
WT20X: DE and UD types
WT30X · WT40X: DE, C and UD types
FUEL TANK CAP
WT20X: C type
FUEL TANK CAP
14
MAXIMUM FUEL LEVEL
25 mm
(1 inch)
MAXIMUM FUEL LEVEL
FUEL TANK TOP
With strainer
(WT20X optional
part)
FUEL TANK TOP
FUEL TANK TOP