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Can anyone tell me please the best front damper for a series D, also are they the same as a C, thanks, Kerry.
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Hello Peter,The Series D was fitted with Armstrong dampers front and rear, but a very different unit for both, the front damper was very well suited to the Girdraulic fork, but had to be used with longer bottom eyebolts than the Series C damper, although sometimes the Armstrong damper shows up in for sale adverts, they will be 65 years old, and to the best of my knowledge are unrepairable or serviceable.
As Marcus says a Koni will do the job, they did manufacture a damper specifically for the front forks which was a little softer than the rear unit, documented in KTB, but even that is normally considered a bit too hard in use to get the best Girdraulic fork action.
Works Performance was good, but no longer available, Spax had a try, but one or two snapped the damper rod in use and consequently was withdrawn.
So you are left with AVO, which is very good, readily available, and, pretty much made to any specification that you require as far as firmness is concerned, and has adjustable damping in situ, which is convenient, it is the damper that is supplied with the Emmanuel/Walker fork mod, but is also available for standard set up Girdraulic forks.
Or newly manufactured Series C damper, or an old one with newly manufactured updated internals available from VOC Spares or Maughan and Sons.
I have been using an AVO for the 6-7 years without any complaint or issues.
Attached is my bike which years ago the owner had on it a good looking seat ! I have never seen another on any D., I might first have a strap made up like Triumphs have just to break up the long flat image.The Avo front damper should be installed using short eyebolts, not long, it is not clear to me what you had to re-machine, short eyebolts are available from most Vincent spare parts suppliers, if you specify the damper without a top shroud it should not foul any of the fork components.
I think the D seat was more than just a design exercise, I think it also created a bit more space for the increased suspension travel, having said that you might be able to successfully craft a B-C seat to fit somehow, but I think you will have to sacrifice something along the way, maybe increased seat height or drastically reduced squab/foam depth and therefore comfort.