Honda TRX400X 2009 Owner's Manual page 105

Engine Oil & Filter
Oil Tank Level Check
Check the oil tank level.
Do not snap the throttle while idling because the oil level reading will
be inaccurate.
Start the engine and let it idle for 5 minutes. If the air temperature is
below 10°C (50°F), let the engine idle for an additional 5 minutes (a
total of 10 minutes).
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Stop the engine and wait 2 3 minutes.
Remove the oil filler cap/dipstick from the oil tank and wipe it clean.
Check the oil level by inserting the oil filler cap/dipstick into the oil
filler hole without screwing it in.
The engine contains a sufficient amount of oil if the oil level is between
the upper level mark ( ) and the lower level mark ( ) on the oil filler 3 4
cap/dipstick.
If the oil level is near or below the lower level mark, add the
recommended engine oil up to the upper level mark.
Running the engine with an improper oil level can cause serious engine
damage.
Servicing Your Honda
97