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What does the oil in Showa outer chamber do?

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If the damping is handled by the internal (and oil) in the damper unit, what does the oil in the outer do? There's no piston/shim arrangement in there, just the spring and the outside of the damper unit. So does it just lubricate the spring and sliders, and keep things cool? So does oil level make much difference then in the outer?

Also, if you put in oil through the air vent at the top of the forks, does this go inside the damper unit?

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It does create damping as the spring guides plunge through the oil, the level sets the airspring, the airspring can be stronger than the main spring when bottomed, the oil also works to prevent hats bottom out, the fork has a bottoming cone setup at the bottom of the outer chamber, yes oil from the vent goes to the outer

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