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WP 4054 Forks Manual
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- Joined
- Feb 19, 2003
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- Location
- Escondido, Ca. USA
A snippet from the ATK Riders Forum. Good info about these forks. Thanks to "Rot Box" for posting this info:
Hopefully this will help someone down the road but so far from what I'm seeing WP made three versions of the inverted 40mm WP 4054 forks.
-The classic non-adjustable. Used on Husqvarna, KTM, Husaberg and ATK's throughout the mid-late 80's.
-The 'multi-adjuster' with rebound adjusters on the top and compression adjusters on the bottom outer portion (small red dial) of each leg. These are what I have on my 94.
-The 'top adjuster' which are the forks posted in the link above. These have compression adjusting in one leg and rebound in the other with the adjustment screws being on the top.
From what I can find the min/max fluid level is 160mm-120mm. both 10wt and 7.5 wt is recommended (depending on the manual) across the board for the 4054 forks.
I've been running mine at 118mm (130mm bottomed out on EVERYTHING) with 7wt oil. Unfortunately my compression adjusters are maxed out on the + setting. That said I really like the performance of these forks. Maybe it has to do with ATK's custom valving? I dunno I hear a lot of complaints about them being super harsh on the KTM boards and such.. harsh is not a word I'd use to describe mine.
Hopefully this will help someone down the road but so far from what I'm seeing WP made three versions of the inverted 40mm WP 4054 forks.
-The classic non-adjustable. Used on Husqvarna, KTM, Husaberg and ATK's throughout the mid-late 80's.
-The 'multi-adjuster' with rebound adjusters on the top and compression adjusters on the bottom outer portion (small red dial) of each leg. These are what I have on my 94.
-The 'top adjuster' which are the forks posted in the link above. These have compression adjusting in one leg and rebound in the other with the adjustment screws being on the top.
From what I can find the min/max fluid level is 160mm-120mm. both 10wt and 7.5 wt is recommended (depending on the manual) across the board for the 4054 forks.
I've been running mine at 118mm (130mm bottomed out on EVERYTHING) with 7wt oil. Unfortunately my compression adjusters are maxed out on the + setting. That said I really like the performance of these forks. Maybe it has to do with ATK's custom valving? I dunno I hear a lot of complaints about them being super harsh on the KTM boards and such.. harsh is not a word I'd use to describe mine.
Hi guys does anyone know Where i can find the bushes for these forks i have dimentions The outer bush is stepped with dimensions ------20 x 2mm x 40 id* (teflon on inside)
and the inner bush is normal* (teflon on outside) * 42.75od* x 13* x 2 mm
Regards james
and the inner bush is normal* (teflon on outside) * 42.75od* x 13* x 2 mm
Regards james
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Hi James, Yes Pyramid do them White Power WP4054 40mm Fork Overhaul Kit
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eric: the 4054's on my '97 atk are fully adjustable. i set the air gap at 130 with 5wt and feel that it is still harsh on loose rocky terrain (which i try to avoid these days). maybe it has something to do with the 2006 front and 2008 rear dunlops (they were put on new just before the po parked it against his shed in flagstaff)
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