BOS Idylle FCV, User Manual

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My fork loses pressure when I remove the pump, what can I do?
Check the valve core tightness using a Schrader valve core tool.
My fork has negative travel, is this normal?
The BOS air spring is designed to lower the engagement threshold as much as possible. Therefore, it is possible on some bikes
that there will be a small negative travel.
Where can I buy replacement stickers or a valve cap?
These items and more are available in our online store.
My new fork has bushing play, what should I do?
The unique bushing alignment and tolerance on BOS forks results in less friction, more sensitivity, and some bushing play from the
factory. If the bushing play feels abnormally excessive, please contact a BOS service center for help.
My fork is lowering as I deflate it, what is happening?
When you deflate the fork by the Schrader valve, you are only emptying the positive air chamber. The negative air chamber stays
under pressure and exerts an opposing force on the air piston and pulls the fork down. To avoid this phenomenon, deflate the
fork in steps of 30-40 PSI and equalize the air chambers between steps (compress and release the fork 5-10 times over the first
20mm – 1 inch) of travel.
I just inflated my fork for the first time and it is really hard, what can I do?
Have you equalized your fork’s air chambers? If not, check how it’s done in the setup section of your product’s user manual.
Did you change your fork’s settings? Check that your low-speed and high-speed compression are at our recommended base
settings given in the setup section of your product’s user manual.
If you’ve equalized your fork, you may have some internal pressure from the production process. You can eliminate this
pressure by slipping a thin ziptie between your left dust seal and your stanchion until you hear the sound of air escaping. Then
reset your pressure and equalize your air chambers.
If you’ve tried all that and your fork is still hard, email customer service and they’ll give you a hand.
My fork was upside down or on its side and now it feels like there’s no hydraulic control.
Your cartridge has depurged – air has entered the hydraulic system. Open bath cartridges like the one used in your fork allow
air to mix with oil. The cartridge purges itself as you ride. You can purge the fork even faster by cycling it through its full travel
5-10 times.
If it is becoming increasingly difficult to purge your cartridge, it may be time for an oil change. Contact your closest BOS
authorized service center for a basic or a full service.
I have about 5mm of travel unused when I ride normally.
Our forks are designed to be very progressive at the end of travel to give you a bottomless feeling. This means that those last
couple millimeters of travel might only be used on the biggest hits or when you case a landing. You can think of them as
insurance to get you out of the trickiest situations. If you have more than about 5% of your travel unused, try lowering your air
pressure by 5PSI and check your compression settings. If your compression settings are much harder than our recommended
values, try bringing them closer to the base settings in your product’s user manual.
4. FAQ 11