First bike with air forks clueless how they work

McG194
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Palm Coast, FL, USA
Edited Date/Time 8/19/2021 5:29am
I pulled the trigger and got a 2021 KTM 350 XCF it was a demo and I'm getting zero hour stock suspension. I'm coming off a 15 YZ250FX with spring forks so I need an air education.

Most likely going to try it stock for a while but what are the best and most cost effective upgrades? Any good resources just to learn a bit about this suspension?

I'm mostly racing Hare Scrambles and a bit of moto but I'm old and not a high flyer by any means, plush is best.
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8/18/2021 12:49pm Edited Date/Time 8/18/2021 12:49pm
First of all, you will get torched on this site for doing a spoke with... involving a 4 stroke. Wait for it.
Happy for you getting a 350. Love mine!
Everyone says that you need to get a few hours on the suspension before having a god base line on what to do depending on your abilities. I re-valved my suspension but am still air up front. I see alot of knowledgeable people go spring. I went with JBI for my suspension mods. I did re-map my ECU at twisted with great results. The REAL upgrade would be a Vortex ECU.
FMF pipe if you feel you need to after that. Enjoy!
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McG194
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8/18/2021 12:52pm
First of all, you will get torched on this site for doing a spoke with... involving a 4 stroke. Wait for it. Happy for you getting...
First of all, you will get torched on this site for doing a spoke with... involving a 4 stroke. Wait for it.
Happy for you getting a 350. Love mine!
Everyone says that you need to get a few hours on the suspension before having a god base line on what to do depending on your abilities. I re-valved my suspension but am still air up front. I see alot of knowledgeable people go spring. I went with JBI for my suspension mods. I did re-map my ECU at twisted with great results. The REAL upgrade would be a Vortex ECU.
FMF pipe if you feel you need to after that. Enjoy!
The reason I used a "Spoke with" is because I've been hoping and hoping for a Yamaha or Honda build a 350. They didn't make it so I had to go elsewhere.
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Bruce372
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8/18/2021 12:53pm Edited Date/Time 8/18/2021 12:54pm
Apparently, that bike will be unridable unless you spend another $3500 on cone valves.

Ps, focus on shock setup first.
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McG194
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8/18/2021 3:22pm
Bruce372 wrote:
Apparently, that bike will be unridable unless you spend another $3500 on cone valves.

Ps, focus on shock setup first.
I've stayed away from the Austrian bikes just because of the suspension horror stories I've heard.

I just don't know all the different options that I have.
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The Shop

8/18/2021 3:39pm
The 21 has the updated fork that is supposed to be a big difference in previous years. I have a 20 350XCF with stock suspension that I race hare scrambles on with little complaint. The last race was really rocky, and that was the first time I was unhappy. But I coulda tried different clicker settings. Also, found the rear shock to be under-spung for my weight. Like others said, setup the rear first. I would ride it as is for now.

PS. I'm wanting to try the kreft plush tank... but maybe I'll just do a revalve this winter. Opinions?
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Jack_Mehoff
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Golden, CO, USA
8/18/2021 4:40pm
One thing give the suspension about 10 hours to break in before you change anything it does get much better around that point
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STLSharky
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Edwardsville, IL, USA
8/18/2021 5:16pm
Bruce372 wrote:
Apparently, that bike will be unridable unless you spend another $3500 on cone valves.

Ps, focus on shock setup first.
McG194 wrote:
I've stayed away from the Austrian bikes just because of the suspension horror stories I've heard. I just don't know all the different options that I...
I've stayed away from the Austrian bikes just because of the suspension horror stories I've heard.

I just don't know all the different options that I have.
yeah those bikes have lost alot over the last 5 years
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8/18/2021 5:19pm
Bruce372 wrote:
Apparently, that bike will be unridable unless you spend another $3500 on cone valves.

Ps, focus on shock setup first.
I’ll have to agree with you on that one. I did forks and shock at the same time but with proper spring rate and valving, the back end kicked out less on jumps and was much more
Predictable.
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FahQ
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8/18/2021 5:22pm
Jackass
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McG194
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8/18/2021 5:25pm
Bruce372 wrote:
Apparently, that bike will be unridable unless you spend another $3500 on cone valves.

Ps, focus on shock setup first.
McG194 wrote:
I've stayed away from the Austrian bikes just because of the suspension horror stories I've heard. I just don't know all the different options that I...
I've stayed away from the Austrian bikes just because of the suspension horror stories I've heard.

I just don't know all the different options that I have.
STLSharky wrote:
yeah those bikes have lost alot over the last 5 years
WTF does that mean?

Obviously they have been winning but when you are venturing into new territory you do it with some trepidation. You ask questions, you try to learn. You know kinda what I'm doing now.
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McG194
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8/18/2021 6:08pm
FahQ wrote:
Jackass
Care to elaborate?
FahQ
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8/18/2021 6:57pm
FahQ wrote:
Jackass
McG194 wrote:
Care to elaborate?
“Spoke with my wallet”
Was looking forward to reading something about your two stroke.

Yeah I’m sure it’s a great bike,
I’ve heard a lot of praise for the ‘21 MX forks. Not sure if the XCF gets the same updates, or how that would translate to the woods.

Just pissed I clicked and it was about a four stroke
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Moto520
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8/18/2021 8:14pm
Done wrong
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Broseph
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Stevenson, WA, USA
8/18/2021 8:33pm
FYI: “Give it 10 hrs to break in” = Ride it just long enough to forget what a good spring fork feels like.
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8/18/2021 8:52pm
Broseph wrote:
FYI: “Give it 10 hrs to break in” = Ride it just long enough to forget what a good spring fork feels like.
That sir is damn funny!! I have to admit, I have forgotten what my Race Tech modded KYB's feel like after a year on my AER's. But really, they're pretty good at the glacially slow speeds i moto at...
Plus, my AER's don't blow seals like my KYB's did.
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8/18/2021 8:55pm
The speaking with the wallet thing is played out and lame. Oh i bought some lock on grips! Speaking with my wallet to those assholes at Renthal!!!! Dumb
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1911
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8/18/2021 9:00pm
There was a time when, Spoke with my wallet, referred to buying a two stroke. Now people use it for anything they bought.
Rawly
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Simi Valley, CA, USA
8/18/2021 9:50pm
Congratulations on your purchase. I have the same bike and love it. Forks are much nicer than what my previous 2019 had. In stock form they are much better than my re-valved 2019. Put some protection on it and enjoy. Remember to check your air pressure every ride.
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luckyguy19
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Albuquerque, NM, USA
8/18/2021 10:14pm
I don't care, I like the "spoke with" threads 2 stoke or 4 stoke. A fellow rider got a new bike, keeping our sport solvent, what's not to like?
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wrc777
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Greenwood, IN, USA
Fantasy
8/19/2021 5:16am
21+ XC forks are super plush. Maybe too plush for a fast rider. Set air pressure before every ride. It is pretty stable but it will move around some with weather changes. Try different air pressures but don't be surprised if it is harsh if you go really low. Also bleed the forks when you check pressure. They can get harsh if air builds up in the damper side. I don't notice this much on the air side cartridge.
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agn5008
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Fantasy
8/19/2021 5:26am
Some of you are real dorks being upset he did a 4 stroke “spoke with my wallet” thread.

The real travesty is he didn’t even post a pic of his new ride 🤷‍♂️
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McG194
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8/19/2021 5:32am
wrc777 wrote:
21+ XC forks are super plush. Maybe too plush for a fast rider. Set air pressure before every ride. It is pretty stable but it will...
21+ XC forks are super plush. Maybe too plush for a fast rider. Set air pressure before every ride. It is pretty stable but it will move around some with weather changes. Try different air pressures but don't be surprised if it is harsh if you go really low. Also bleed the forks when you check pressure. They can get harsh if air builds up in the damper side. I don't notice this much on the air side cartridge.
Too plush for a fast rider..........

I should be good then. Laughing Laughing Laughing Laughing Laughing Laughing
McG194
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8/19/2021 5:35am
agn5008 wrote:
Some of you are real dorks being upset he did a 4 stroke “spoke with my wallet” thread. The real travesty is he didn’t even post...
Some of you are real dorks being upset he did a 4 stroke “spoke with my wallet” thread.

The real travesty is he didn’t even post a pic of his new ride 🤷‍♂️
i changed the title to not offend the snowflakes. I never knew the "Spoke with my wallet" mafia was so strict.

As far as pictures I pick it in a week and a half because I'm going on vacation today. Kinda hate that part but I am going to Budds so that makes it worth it.
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CKNY
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8/19/2021 5:45am
wrc777 wrote:
21+ XC forks are super plush. Maybe too plush for a fast rider. Set air pressure before every ride. It is pretty stable but it will...
21+ XC forks are super plush. Maybe too plush for a fast rider. Set air pressure before every ride. It is pretty stable but it will move around some with weather changes. Try different air pressures but don't be surprised if it is harsh if you go really low. Also bleed the forks when you check pressure. They can get harsh if air builds up in the damper side. I don't notice this much on the air side cartridge.
Not plush in roots and rocks or square edge over an inch and a half.
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8/19/2021 6:18am
You can put your rider info into the Spring Rate Calculator on racetech.com and it'll give you recommended air pressures and sag for your bike.

The AER fork is pretty good for an air fork and a lot of riders don't have massive complaints from the stock setting. Sure it can be better, but it isn't all bad by any means; in fact, most guys are happy on a well set-up version of the AER fork until they ride a bike with a spring fork properly setup for them and remember just how good that feeling is.

Enjoy the new bike!
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Darrin Willis
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Red Deer County, AB, CA
8/19/2021 6:44am Edited Date/Time 8/19/2021 6:45am
Dont listen to anyone who says select an air pressure for your weight and leave it there. My 2 cents. I run 140 ish for moto. 125 ish for harescrambles. 170 lbs 52 year old vet.19 350 xcf .
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sandman768
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Saratoga Springs, NY, USA
8/19/2021 7:12am
Use a rubber oring on one of the fork tubes. When the oring is about 1-1.5 inches from the bottom, that will be your air setting for your terrain, then fine tune with clicker settings. Give them a chance to break in, remember to bleed the screws on fork caps. Make your own determination on how the forks feel, everyone is different.
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Jeff_Brines
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Jackson, WY, USA
8/19/2021 7:45am
You'll get a lot of opinions here, which is fine - it is a forum after all.

However, it does baffle me the number of people who chime in with no prior experience on the forks, or having had experience on a different model year, application or displacement (it matters).

You'll likely find the forks on the 350XCF to be more than fine unless you are really picky. Set them dead stock for your weight (find a chart for the air pressure) and ride it. Make sure you fill the air spring up correctly (front wheel off the ground) and set the pressure at the altitude and temp you are actually riding at. Make sure you burp the outers too.

I find these forks to be very good, very versatile and very easy to tune. I'm more of a full time woods guy on a lighter front end (300) so I did pull some of the compression damping out of the forks (added float to the midvalve) which helps with deflection and tracking through square edged bumps. In a 4 stroke application, you may be just fine as is. If I had one compliant it would be to further "open up" the compression valving so they do not spike when I smash I 3-4" rock I don't see. But this is VERY challenging to do with ANY fork.

From an technological and architectural perspective, the product is very very good. WP lacked attention to important details early in the release, but at this point - they really are very good out of the box.
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Jeff_Brines
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8/19/2021 7:47am
Dont listen to anyone who says select an air pressure for your weight and leave it there. My 2 cents. I run 140 ish for moto...
Dont listen to anyone who says select an air pressure for your weight and leave it there. My 2 cents. I run 140 ish for moto. 125 ish for harescrambles. 170 lbs 52 year old vet.19 350 xcf .
I disagree with this. I want the handling of the bike to remain the same through corners regardless of the type of event I'm doing.

By dropping air pressure, I get a lot of front end dive and changes in geometry of the bike.

While I will drop a handful of psi (3-4 max) for something like a hard enduro where cornering is less important, I can only go so far before its absolutely terrifying from a "Imma go over the bars" perspective.

In order to get the forks to work better in chunder/choppy terrain, revalving is a better option. Again, getting more fluid flow for high speed impacts is what we off road/non -MX guys want.
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Steve125
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USA
8/19/2021 7:51am
I used the online Owners Manual to help get a baseline for my 21 Husky. Set your pressure in the morning and leave it alone the rest of the day. Remember, after the first ride of the day, baseline pressure will be affected by temperature, If you add some air during the day because its way off, just add that same amount to your baseline setting the next day. As stated already, use the o ring as a bottoming guide. 1" from the bottom is good. After a few ride days you'll know where you want to be on your cold setting, then you can play with the clickers.
I'll also agree with the break in needed for these forks. 6 hours and mine smoothed right out.

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