1998-2004 Honda Foreman 450 factory service manual, Page 73Get this manual
MAINTENANCE ENGINE OIL AND FILTER CHANGE
If the engine must be running to do some work,
make sure the area is well ventilatedNever run the engine in an enclosed areaThe exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to death.Run the engine in an open area or with an exhaust evacuation system in enclosed area
Warm up the engine
NOTE: Change the engine oil with the engine warm and the vehicle on level ground to assure complete drainingStop the engine and remove the oil filler capdipstick and drain boltDrain the oil completely