Honda FourTrax Recon TRX250TM 2019 Owner's Manual page 62

Starting & Stopping the Engine
Low Air Temperature 10°C (50°F) or below
1. Follow steps 1 – 2 under "Normal Air Temperature."
2. Warm up the engine by opening and closing the throttle slightly.
3. Continue warming up the engine until it runs smoothly and
responds to the throttle when the choke knob is at fully OFF (B).
If the engine doesn't start after pushing the start button several
times, use the recoil starter.
NOTICE
Extended use of the choke may cause the spark plug to foul, impair
piston and cylinder wall lubrication, and shorten the life of the
engine.
Do not race the engine during the warm-up period.
Racing a cold engine wastes fuel and increases engine wear.
Snapping the throttle or fast idling for more than 5 minutes may
cause exhaust pipe and muffler discolorations.
52 Basic Operation & Riding