I am certainly not an expert on winches but...
A 2500 pound winch is only rated to pull that much for around 10 seconds with a ten minute recovery period. So if you bury your ATV in deep mud, it probably will exert much more that it's weight in drag for the winch. If you winch for 10 seconds and move five or ten feet and then you "rest" for ten minutes, you're probably not having much fun anymore.
At lower loads, the duty cycle increases, which is why you buy over-rated winches.
Read ALL the fine print, so you know what you're buying.
Ok, I guess I will try to put an end to all the confusion and misinformation in this thread.
The above statement is only partially correct and in reality, duty cycle has very little to do with an electric winch on a ATV/UTV. You can pull, stop, pull, stop until the cows come home. You may burn out the motor, but that is the least of your problems.
The main flaw (and it is a serious flaw) with what people are saying about their 2500lb winches is that they will be fine and a 4K is overload.
Absolutely incorrect, period.
A Mule Trans weighs right around 1500lbs.
A winch is rated at the particular capacity with ONE winding off the spool. That is about a foot of wire. For each further wrap off the spool, the load rating drops dramatically. If you have a 15 foot cable and it is fully wound out, your pulling capacity is NO WHERE NEAR 2500lbs. Please stop thinking it is because you are setting someone up to get seriously hurt.
If you are stuck or you are pulling something heavy and you have that little 2500lb winch spooled out all the way, when it snaps, it can easily cause death and certainly cause serious bodily injury. You are pulling against both the 1500lb Mule and whatever object you are trying to move (or get yourself unstuck). Think about it. Anyone that knows anything about logging will tell you just how much damage a steel cable traveling at 100mph can do.
The factory rating from Warn, Superwinch, Viper, etc for a Kawi Mule is 4000lbs, not 2500lbs.
Putting the correct rated winch on a Mule is an extremely tight fit. I am actually in the process of doing a test fit for Viper at this moment, as their winch is just a shade too big. I am trying to sort it out so it will work as intended.
You can poo-poo the above info, or you can take it to heart as you choose, but I have done lots of research on the various winches and the info comes directly from them, some of it right from their lips to my ears, some in writing.
I honestly would hate to see someone get hurt due to a poor decision. You can say "Well, I have used my 2500lb for years and nothing happened yet". The key word is "Yet".