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I like the fork. Once you get it set up to your liking, its as good as anything. I used the skf hd 48k seals, and factory bushings on the dlc coated forks.
I've got 2 sets of KYB PSF1 A-kit air forks (1 set on CRF, 1 set on YZF) + 1 set KYB A-kit spring forks (on YZF). Both are amazing, but I have to say I **really** like the adjustability of the PSF1s. A LOT.
I recently spoke at length with an ex KYB Factory Tech who worked with KRoc and ETomac on air forks when they were under serious development and he said they got the air fork to perform better than the A-kit spring forks. There are a number of reasons that air forks went away on production bikes, I get it, I also deal with R&D vs. production decisions, but I am here to tell you that my Vet B/C opinion is that A-kit air forks are AWESOME - their bottoming resistance is unbelievable and their adjustability is very useful and frankly, fun. And the A-kit spring forks are awesome, too.
I'd reach out to Klint Stapes. He has some "special sauce" for setting up air forks. He learned a lot in his tenure at ENZO and KYB as well as a career as a pro rider. He can help you with this decision, for sure, and revalve air forks to your liking. Here's his contact info:
Stapes Suspension @ 951-833-4043
https://www.instagram.com/stapes_suspension/
I eventually converted them to spring just to eliminate that. I’m not a racer and just a vet weekend warrior and I didn’t like dicking around all the time with the air pressures to keep them feeling good.
https://www.airprofork.com/snowbikes
https://www.pegasusautoracing.com/productselection.asp?Product=3336&utm…
(correct - this is NOT its typical application and it needs some modding)
The Shop
Recap:
I am building a system where I manually bring into play a checkvalve (that cracks at ~ 34 psi) when a thumb-operated (button) valve opens the pathway to the pressure in the PSF1 main chambers when the forks are uncompressed (over jumps, during wheelies, etc.). I bleed off the excess pressure (anything in excess of ~ 34 psi) as I feel the fork getting stiffer in a moto session.
2. Do the yz - 17 caliper fit the kxf fork, or do you need a 270mm brake disc adapter for the kxf
3.how muck did you lower the yzf-17?
I'm thinking of putting a set of kxf psf1 on my yz450f - 18
The yz had modded kit style, and shock was 5mm lower. You should be able to use the kx on a yz, but lugs obviously different so that will be something to consider. We took brakes, wheel, etc and made it work. Had a few bikes. Trees shouldn't be an issue, but I would look at offset that psf kit uses when they fit them to other makes. Did well at hangtown nat in 14 with slightly modded fork on 14 kx450. I do like those forks, and besides the aer, it's best imo.
Im thinking I could use an brake disc adapter/hanger 270mm from a kx/rmz, and then the yz caliper would work.
And if I use the 20/25 mm axel from the yz 2t with a sleeve the yzf wheel should also work.
Please correct me if I'm wrong
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