Oil changing in bajaj pulsar 2004 model - 2005 Bajaj Pulsar 150

Start the engine and run for about 5 mins to heat the oil up, this helps the oil to come out of the engine.

turn engine off
undo oil drain bolt (remeber to have a basin underneath to catch old oil)
undo oil filler cap (more oil will come out)
pour some fresh oil in to clear out remaining old oil
clean and replace oil drain bolt and washer
top up with correct amount of 20W40 (recommended JASO-MA 20W40)

list of instructions can be found here http://bajajpulsar.org/?page_id=9