The forks on my 39 are the girders with limiting springs. I'm in the process of putting the forks back together after checking, cleaning, etc.The check springs are adjustable in length, and I have found no info anywhere on how to set them up. Everything seems to be in good shape, and the forks move freely up and down, just want to do things right the first time.
Bill
Mine are just snug so they…
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Springs
Thinking along those lines. These were a job to get off because they were under a lot of tension. One thing I found was that the bearing race in the upper mount was loose, and had moved around to where the little hole that is above the grease fitting wasn't where it is supposed to be, blocking the balls from any fresh grease. I enlarged the hole a bit and locked it into place with bearing retainer.
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Can anyone describe the…
Can anyone describe the difference in fork behaviour with and without them? They were described as being added to reduce forks "pattering". But the way to reduce unwanted vibration is to add damping, not more springs. An extra spring only increases the stiffness and therefore frequency of vibration. The geometry does make the front spring progressive so it gets stiffer as it compresses so they should reduce the fork deflection under full load.
Were they really a marketing gimmick? Someone with race experience might know better? Everyone else managed without them.
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fitted with wheel on ground?
Are the springs meant to be fitted with the wheel on the ground or lifted up free? Seems that they are meant to limit the travel so the forks don't top out. I may try the bike with them off, and then installed to get a feel for how they affect things.
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They weren't intended to…
They weren't intended to limit travel. (WD16H had rubber stops for that purpose.).
They become tighter as forks are deflected up more. So I fit mine when forks are off the ground with a jack under the engine / frame. The Inter ones are adjustable length so they get shorter or longer if the spring is turned. On my 16H they just have to be pulled in place..as far as I can remember.
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Mine are just snug so they don't rattle when as slack as they can be. Their tension increases by the same amount for every step rise in height of the fork, so (as far as I can work out) the actual starting tension is not important. But they shouldn't rattle about. (And it's not easy to assemble them at a high tension.