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SL: Series 'D' Enclosures Black Prince Seat Height

tom wilson

Well Known and Active Website User
VOC Member
Hi I shall soon become a new owner of a Black Prince .... cannot wait. I only have a 29" inside leg and I would love to lower the seat height, I would have thought some Vincent owner out there has reduced the seat height .... I cannot be the only short legged owner! What would/will be the best way to lower it without affecting the handling ... shorter spring, softer spring, multi tension spring or can the spring mounting points be lowered etc. Does someone out there has the answer? No I do not want to wear platform boots or carry ladders etc.
 

kerry

Well Known and Active Website User
VOC Member
Difficult one to answer as it varies but on the three I did I just made up little shoes on rod that goes inside the existing so you can juggle before light welding, on one we threaded so they are adjustable, it is only about 1/2" that we cut off at first.WP_20210327_15_40_19_Pro.jpg
 
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vibrac

Well Known and Active Website User
VOC Member
I am very pleased with my two AVO rear units one on my Comet and one on our twin racer The comet has a coil over on its Brampton as well but its not AVO (yet.) certainly its the best handling Comet (and I have had a few) I have ever ridden, and the twin has already proved itself.
 
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Gary Gittleson

Well Known and Active Website User
VOC Member
I took my first short ride yesterday with the new AVO at the rear. It lowered the bike by about 1 1/4". I can now easily kick start it with my left foot on the ground and without the aid of a stand.

I believe I need to make some adjustments. It bottoms out on bumps a little too easily. I assume that can be corrected with the preload adjustment.

It also needs damping adjustments. After a bump, the rebound is not sufficiently damped which causes a second hop.

Does anyone here have suggestions about these issues? How much preload should I try first? It's rather cumbersome since it seems that I will have to remove the fuel tank, take a stab at the adjustment, replace the tank, test and so on. And how does one adjust the damping? The thing came with no instructions.

I have not decided yet whether I want to shorten the center stand. It's not too difficult to use it as is. Taking the bike off the stand is a little bothersome, especially if I do so while mounted. I'll give it some time to get used to it. Shortening the stand is pretty easy and not difficult to reverse if necessary.

Gary
 

Peter Holmes

Well Known and Active Website User
VOC Member
Gary, I have one of these coil over shocks fitted to my Series D Comet (replica), and although I did have to remove the seat and tank to initially fit the shock, you should not have to do any of that to change the preload or the damping settings, the preload should be accessible by lifting the seat up and using a C spanner (rather annoyingly sold separately) to adjust the threaded collar to compress the spring, the damping setting is just an Allen headed adjuster near the base of the unit, clockwise for more damping, anti clock for less.

I have to say it is a pretty fine balance to get it correct, I normally ride two up and in the end I requested a heavier spring and used it with very little preload, and I think with the damping on the max setting, works fine now, but can bottom out occasionally when working really hard, appalling roads etc. It is definitely superior to the standard Armstrong unit and also the Spax unit that came fitted to my bike, I would imagine the Works Performance one would have been a good one to have, sadly no longer available. We are lucky that AVO even bother, I doubt that it has even paid for itself yet, it probably never will.
 
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hadronuk

Well Known and Active Website User
VOC Member
Hi Gary, the damping is adjusted with an Allen key applied to the adjustment screw at the bottom of the damper.
From memory, about 4 turns or 16 clicks total adjustment range. Don't force it!
Screwing it in stiffens the damping. I have not personally tested the D series units as I have a C, but you will probably find it is not excessively damped at maximum, so perhaps start there, then back off if required.
Ah, I see Peter is advising. Excellent!
 

Gary Gittleson

Well Known and Active Website User
VOC Member
I'll give these adjustments a try. I may have a suitable C spanner. I'm still not sure I can get in there without removing the tank. The bike is a twin and it's pretty crowded in there but I'll give it a try.

Yes, the Thornton is pretty good but there's no facility for lowering the bike with it, so it will probably find its new home on the shelf with all those other used Vincent parts that will probably never be used but nevertheless refuse to leave the premises.

I'll report my findings.
 

tom wilson

Well Known and Active Website User
VOC Member
UP-Date I have now ordered and paid for an AVO suspension unit (that was the hard part, ha ha). Hopefully my Prince will land in a couple of weeks, I shall measure the seat height before and after the AVO is fitted and report on here. Note: the rain will be guaranteed the day of my first planed ride but ...... who cares it is an enclosed 'D' ha ha. Thanks to all on the advice given.
 

timetraveller

Well Known and Active Website User
VOC Member
Gary I think that there is something wrong with you ideas about doing the adjustments. They are all near the lower end of the unit and nowhere near the top which is still not near the fuel tamk. The damping adjustment is a socket headed screw and the spring adjustment is with a ;C; spanner on the aluminium ring at the base of the spring. There is a plastic locking screw in the side of the aluminium ring which needs to be slackened first.
 

Gary Gittleson

Well Known and Active Website User
VOC Member
Norman,

I have to disagree. I think I can just see the damper adjuster at the base of the cylinder by peaking between the spring coils, but the spring preload adjuster is exactly as you describe but is located at the upper mounting end of the shock. Unless we are saying that I mounted it upside down? I just went by the diameter of the holes of the bushes. Maybe the bushes are interchangeable and were placed incorrectly by the factory. I'll have to check that. Of course, that means removing the shock altogether.
 

hadronuk

Well Known and Active Website User
VOC Member
Norman,

I have to disagree. I think I can just see the damper adjuster at the base of the cylinder by peaking between the spring coils, but the spring preload adjuster is exactly as you describe but is located at the upper mounting end of the shock. Unless we are saying that I mounted it upside down? I just went by the diameter of the holes of the bushes. Maybe the bushes are interchangeable and were placed incorrectly by the factory. I'll have to check that. Of course, that means removing the shock altogether.


Should look something like this Gary:

20181009_092742.jpg

Left hand end towards back wheel. According to my notes, the top pin is 1/2" diameter & the bottom pin 3/8" diameter.

HOWEVER
I seem to have no notes or pictures of the metal spacers, which as I recall are top hat shaped to keep them in place during fitting to the bike.
Apologies for my sketchy memory.
Perhaps a AVO D owner can advise details of these spacers?
 
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hadronuk

Well Known and Active Website User
VOC Member
Just between you and me Gary, AVO are very nice people who have been extremely helpful,......but quality control is occasionally a little variable! We ended up developing a lot of different units for Vincents, all with slightly different fitting bushes. Units are produced in batches, so assembly may be given to someone new who has not done it before. So I am not very surprised your unit arrived with the spacer bushes assembled wrongly. Sorry!
 

vibrac

Well Known and Active Website User
VOC Member
I am just about to take my rear coil over (today I hope) from the racer to the AVO counter to get a stronger spring and revalve the range (its at its stiffest maximum now) if possible in the time before the next race I will let you know how I get on
 

Gary Gittleson

Well Known and Active Website User
VOC Member
I re-installed the damper yesterday. It went straight on in the reverse position after switching all the bushes. I checked the valve adjustment. It was one click in from the softest. I am going to try it at 15 clicks in. I did not change the preload yet, thinking that additional damping might be all I need. I realize that there's more damping on the rebound, but there's probably some on the compression stroke too. I'll let you know how it works later today.
 

timetraveller

Well Known and Active Website User
VOC Member
Others with the AVO damper on the rear of 'D's are better informed than I am but extrapolating from experience with the coil overs on the rear of 'B's and 'C's I think you will find that you now have too much damping. Good luck. Chris Launders made a very handy gadget to sort out the difference between spring and damper effects. He made a telescopic tube that would sit alongside the coil over unit and then put a cable tie round that telescopic unit. This allowed him to see how much of the travel the spring was allowing as opposed to the damper.
 

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