Would you change this air filter?

No I would not change that. 

Looks like you just rode around the block lol. She's fine

i’m meticulous about my filter maintenance… that being said, id run that if it had Maxima FFT oil on it! 

Drive it on...

You can change this stuff too often and unnecessarily, just like oil.

YES, Ron Lechien would be disappointed, You didn't use the blue stuff 

That model of Yamaha needed a lot less filter maintenance than the older of even newer models. That’s got plenty of use left. Just make sure the oil isn’t drying out is all. 

If my dog and I need a break from the family, yes, we would go out in the garage and change that filter. Otherwise, no.

I have a day at the sand track, 2 days at a dust bowl practice track and a race on my filter. No toil. Clean as a whistle behind it and all down the boot. That's a bit more then I would normally leave it. I run normally 5-6 engine hours depending on conditions. This is also on a yz250f as well.

No, it's barely dirty.

I've seen people that say they change their air filter every ride "whether it needs it or not". And to me, that makes no sense whatsoever.

In the 90s, I used to know a guy that owned high performance cars, he never emptied the ash tray, just bought a new car.

If I can still see my air filter oil color, its still clean.

That's not even caked on good like I like mine. When it's all brown is when I clean.......lol.

I do check my intake boot when it's caked on thick just to see how good the filtration system is working. You be surprised how much these filters can take and still breath.

I’m having involuntary twitches reading this. I’m the over maintainer that oil and filter companies love. 

I would get a no toil/ twin air/ d2 filter and cage kit on that thing!

but that filter looks fine. 

This man has the game figured out.

There is zero chance I'm even thinking about changing that sucker.

How many days, weeks, or months between rides?

Just clean it and be done with it.

Raced with a guy years ago and his bikes were always abused. He had a 6 month old 1991 YZ250 and it wasn't running right and sounded choked up. Someone asked if the air filter was clogged and he replied "filter.? what filter?" Took the seat off and the airbox was half full of mud. No idea how that thing was still running. He would literally ride bikes till they died.

It’s clean and probably is good for another ride BUT a rule of thumb I always use is it’s cheaper and easier to clean and oil filters then it is to shim valves and do top ends 

after I ride I take the filters off spray carb cleaner on a paper towels wipe around the air boot and install a wash cover and wash the bike. I try to keep the air box as spotless as the whole bike. I let the filter soak in a bucket with oxy clean and wash it with dawn 

I oil the filter with green no toil one to two days before I’m riding and let it dry.  I install it right before I load the bike up or the night before. I can’t stand dirty air boxes or filters sitting in the bike 

using this method on three different bikes that I have put 60+ hours on I have never once shimmed a valve or had one to move any real distance 

To each their own but I pop the cover off after a ride and my filter looks like the OP’s I’m not even thinking about changing it. I’m all about maintaining my stuff and keeping it in good running order but changing that filter or changing it every ride regardless is overkill IMO

This is the good thing about having a meticulous air filter regime; you know it’s been well cleaned and thoroughly oiled, so yes you can leave it in with confidence.

I wish my filter could look like that after one ride. 

Absolutely wouldn’t even think about changing it. I go 2-3 hours in the sand, but I ride alone, so that’s a factor. As another poster said, if I can see the oil color, I’m riding it. I also don’t wash my bike, as I only wash it with an air box cover on. So every 2-3 rides/hours she get the full detail with wash, filter, oil and oil filter. 
 

Only time I am changing that filter is if water got on it or it’s been sitting in the bike for more than 2 months. 

Was this a serious question? 

mine look worse than that when they're freshly installed..

My 2016 YZ250F would be absolutely caked after 1 ride at a sandy track or a dusty trail.

The filter shown looks damn near new.

Still has some life left. 

As I understand it, the filter goes through stages.

Well oiled, the sticky of the oil keeps the fine dirt from passing. If the oil's fresh, it migrates through the debris catching more debris on top of debris. Eventually, the debris coating the filter does not collect more debris from adhesion but the holes between the debris get so small, the actual debris becomes the filter. Eventually the oil becomes so dry added with vibration, debris starts to break off and go into the engine creating holes where new debris just passes into the intake as well.