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Yeah, I noticed that after the fact... the caps have a preload adjustement, which will allow you to set (static) spring sag. Not a big deal in my book, but whatever.

Oh, and a little vent screw to burp the air that gets squeezed out of the fork oil (I guess).

The replacement top cap also provides an external spring preload.
 

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Discussion Starter · #8 ·
Hello

Oh, and a little vent screw to burp the air that gets squeezed out of the fork oil (I guess)..
If this is really true, it is a very important improvment : it means that the fork will be softer in compression as the air chamber will not be closed anymore. When I changed the OEM springs for Wilbers progressive springs, I also increased the air chamber size, by removing some oil, and this has softened the fork in compression.

Air is compressible, when oil is not and if the air chamber is no more closed, it means that oil and air are no more used to manage the compression behaviour. Oil is only used for damping, then.
 

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I believe that they should not be left open. They are used to only settle the ride height once the forks have been pumped up and down a few times and then closed. This allows the oil quantity and air gap to be fixed to the damping specification you want to achieve. My 1974 GT750 had these fitted!!
 

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Discussion Starter · #11 ·
Hello
I believe that they should not be left open. They are used to only settle the ride height once the forks have been pumped up and down a few times and then closed. This allows the oil quantity and air gap to be fixed to the damping specification you want to achieve. My 1974 GT750 had these fitted!!
For sure ! If the fork is opened at its top, it means that the air and oil within the fork will not be compressed at all, when the fork goes down.
 
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