The RT body is custom made to provide a groove in the body for a X ring seal and the OD is a sliding fit inside the stanchion. As the forks compress the RT valve moves downwards relative to the Fork bottom instead of being static on top of the damper body and using a sliding seal on the stanchion.Ĥ. 3 A 1996 survey of 13 700c road forks found a maximum length of 374.7 mm and a minimum of 363.5 mm. 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. The length of the fork is usually measured parallel to the steerer tube from the bottom of the lower bearing race to the center of the front wheel axle. 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. This is a killer because now I know that the forks on my bike are not from a 750K and not from a 750F but I dont know what they ARE from and I need to know so I can replace them Does anybody know what model of CB750 (if any) has fork tubes of length 580mm and OD 35mm. I have them in Triumph forks as rebound dampers and the oil does aerate and I have been looking for the problem. The length of the tubes on my bike is 580mm. The problem with the RT valves being used as rebound seems to be specific to the Norton application.
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