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1/18/2026
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Sint-Maartensdijk
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My 2025 xact aer forks feel very stiff,i set the air pressure as low as 130 psi and made sure the forks are lined up correctly but that didn't help
I want to open them up to see if the first owner maybe put too much oil in it or wrong seals
The left forkcap looks like this,i don't see the black plug in the manual pictures:
What is it for ?
The black plug stays in. You can ignore it.
Have you opened up the bleeder screws (small Torx screws) on both fork legs before each ride?
(Lots of people are unaware that they need to bleed the air-spring side of these WP forks)
It's possible there is too much oil in the outer legs if it is too firm at the bottom half of the stroke.
Which bike do you have and what's your weight? Are you riding Moto? Off-Road?
(130psi is firm for a light guy on a 125SX and soft for an average guy on a 450SX-F).
Thanks for your reply.
I have gone through all the basic steps again
It is my sons bike by the way,a 2025 ktm sx 250,he weighs about 83kg with full gear
I opened the bleeder screws again and a lot of air escaped,so that will help.
But i found out he had a collision with another rider on the side off his forks and i loosend the axle clamp and the fork popped out almost 5mm.
All those things together probably explain the stiff feeling.
We will try on the track again with 140 psi and see how it handles now
Free sag on the rear is 35mm so that should be oke.
Reset those axle clamps every ride day or anytime the fork feels bound up.
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Let the air out on both sides. If it doesn't compress its possibly 1 fork spring in 1 side.
My Rockstar Edition had the 1 spring setup on it that was added to it before I bought it with this cap on that side.
Your air pressure is way way to low!
You should be around 155-156psi.
I started with 10,8bar/157psi and ended at 10,9bar/158psi at 90kg naked. Measured with warm forks after the first turn and bike at the stand with both wheels of the ground. Air pressure is crucial within 1psi. Try to get a digital shock/fork pump with a no air loss adapter like Topeak Pocketshock digital or the digital RockShox pump. Makes adjusting and fine tuning air pressure a lot easier. Save the original WP pump for bigger air pressure changes.
My SX250 2025 forks and shock are really really good right now. Never thought I'll say this about a stock suspension!
Does your setup soak up the small stuff like breaking bumps?
Thats where my forks feel very harsh.
What is your skill level?
Your forks must feel harst with that Setup, it rides way to Low coming into braking bumps.
Don't confuse Speed with weight. You need to Setup your Bike for your weight with the right spring and sag and the right Air pressure. There are Personal preferences and what you Ride (SX, MX, woods) that May Change that a bit, but Not that much.
Damping Setup ist where your Speed comes really into Play.
Try those Base settings for your forks and Ride.
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