The Triumph forks have external springs and no damper bodies so the valve is held fixed in the stanchion near the bottom and the external RT body seal is a static seal ie not sliding.ģ. Not tried this on the Norton forks but the single lipped seal maybe where the air is coming from.Ģ. On extension with no springs in play the forks try to pull back due to the reduced internal pressure until the air leaks back in through the top fork nut. On the bench you can feel the air compress inside the forks and the excess air slowly leaks from the threads of the fork top nut over a few minutes. Triumph forks seals are double lipped instead of Norton single lipped. There are differences in the design when applied to Triumph shuttle valve forks compared to Norton but which of them individually or collectively cure the aeration I cannot say.ġ. I have them in Triumph forks as rebound dampers and the oil does aerate and I have been looking for the problem. The problem with the RT valves being used as rebound seems to be specific to the Norton application.
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