I own a Pulsar Y182-7B40 but the second hand stops at 25 seconds past but when I press any button it starts again. Although the second hand has stopped the watch keeps perfect time. what can I do?

once you press s1 its starts, you press again its stop.
press s2 it get reset and stop.
try that.

mcdedevito75 here, Return to the watch rep[air that installed the battery for adjustmaet.

The large seconds hand will remain at 12 unless you press the upper right button to start it. Pres again to stop it and press the lower button to reset it. The small seconds hand that always runs is the seconds for the time. The large seconds hand is for the stopwatch function. If you like to have it running all the time just start it and leave it running - it won't harm the watch.

This may sound obvious but it needs to be repaired by a jeweler/watch repair shop. Although it is possible that the stop watch second hand is out of sync it would usually mean that the stop watch is starting at 3 seconds before 00:00 for 57 stop. If that's the case you should be able to readjust the start/stop position by pulling the crown out to 1st or 2nd position and then pressing the stop watch start stop buttons. One press, one position. Although I am not certain of the exact sequence.
However if you are unsure or it starts at the 00:00 position you need to find a jeweler you can trust to do the work. Check out a few places and ask to see the credentials of the watch repair person then compare and make an informed decision. Don't just use the jeweler at purchase point.
Most times, if it's a simple repair, like readjusting the hands a good jeweler will do it for nothing.

Good luck

To set the timer hand on these models of Pulsar watches, do the following: 
Looking at the face of the watch, there are two buttons and a crown on the right side. The TOP button is Button "A". - The BOTTOM button is Button "B".
There are 3 positions on the crown: IN (#1), FIRST CLICK (#2) & SECOND CLICK (#3).
First, pull the crown out to the second 'click' position (#3) ... This is all the way out. (STOP THERE! Pulling harder will harm your watch! Don't try to pull past position #3!)
Push and hold Button "A" for two (2) seconds. The dial will sweep around to the 12 O'clock position. You can advance the timer while the crown is in position #3 (second click out) to reset it back to the default position. 
The manual says that if you pull the crown out to position #3 while the timer is measuring, the hand will reset back to the 12 o'clock position... I haven't tried that, so I can't confirm.

Short answer: You download the Operational Guide from Pulsar:

http://www.pulsarwatches.com/home2.asp#FAQ (look for N944 which is PGC series).

Longer answer: It is baffling to do this without the manual. You put the watch in -0- mode (crown fully in), pull the crown out to first stop, then us the A and B buttons to zero the 1/10th and second hands, then pull the crown out to second stop, then use the A and B buttons to zero the minute and hour hands. Then, you put the watch in "Time" mode (crown fully in), pull the crown out to the second position, and use the A and B buttons to set the time. You have no functioning second hand except for the stopwatch - in Time mode it acts as the calendar hand.

Pull out the crown and use either a combination or one of the cronograph buttons, this will allow you to adjust the hand positions

The "second" hand on this watch is not actually a 'sweep' second hand, as on other watches.
This is a timer dial. ["Stopwatch 1/5 Second Hand"]
To start/stop this, use the top button (Button "A").
To reset this dial to 12 O'clock, use Button "B", after first stopping it with Button "A".
The "second" hand is the small dial at the 9 O'clock position.
In actuality, you 'could' start this and just not stop it...  Then it would function as a "large second hand". That would be up to the owner. (it might use more battery power though... ?)

The larger second hand on the Pulsar PF8036 is part of the stopwatch feature. The upper button starts/stops the stopwatch feature, and the lower button operates the lap/reset function. Why they made the larger hand work only with the stopwatch instead of the smaller hand to the left is beyond me, but that's how it is designed.

for my victorinox, the crown out one position and the reset button (lower chronograph button) changes the minute hand and the top (start/stop button) does the 10th's of a second...crown all the way out and top (start/stop button) does 30 second intervals for the minute counter.