Honda TRX420TE Owner's Manual page 160

Tyres
Always check air pressure when your tyres are ''cold.'' If you check air
pressure when your tyres are ''warm'' even if your ATV has only
been ridden for a few miles the readings will be higher. If you let air
out of warm tyres to match the recommended cold tyre pressures, the
tyres will be underinflated. Be sure to check tyre pressure at the riding
site, since changes in altitude can affect air pressure.
The recommended ''cold'' tyre pressures are:
RECOMMENDED
PRESSURE
RECOMMENDED
PRESSURE
Servicing Your Honda
152
FRONT
25 kPa
(0.25 kgf/cm ,
3.6 psi)
25 kPa
(0.25 kgf/cm ,
3.6 psi)
REAR
25 kPa
(0.25 kgf/cm ,
3.6 psi)
25 kPa
(0.25 kgf/cm ,
3.6 psi)