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Advice on SEVERE tank slap

mach1ne

Website User
VOC Member
Hello everyone,
Can anyone give me their thoughts on the cause of tank slap on a 1951 series C Black Shadow. The bike has freshly refurbished Vincent shock absorbers, the wheel bearings are OK, the headstock bearings feel tight and smooth and when lifted off the ground , the Girdraulic forks have no perceptible play. It has a 19" front wheel with a new ribbed front tyre running at 25 PSI.
I'm only fairly new to this bike , but have covered about 1500 Km, without any other signs of major headshake. A couple of weeks ago, on a club run, it had a head shake that was that severe that it shattered both my wrists and threw me onto the opposite side of the road. My wife , who was following me , said I did'nt go up in the air , just straight sideways off the bike. The road was smooth and dry tar with an old road repair perpendicular to it, which had subsided slightly and had a small bump a few feet prior to the repair. I was doing about 80 Kmh on trailing throttle in anticipation of an upcoming tee intersection. The steering damper was only just tightened enough for round town riding.
Any information would appreciated.
:confused:
Thanks
Dean
Canberra
Australia
 
Last edited by a moderator:

krautrapide

Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mercurycrest

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VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

rbove

New Website User
Non-VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

Tom Gaynor

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Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

Howard

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VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

PaulB

Well Known and Active Website User
Non-VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

Howard

Well Known and Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

PaulB

Well Known and Active Website User
Non-VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

Howard

Well Known and Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

samueljohn

Active Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

mach1ne

Website User
VOC Member
Running the Vincent H.R.D. Owners Club online forum costs money, and like other organisations, we have annual software and hosting costs which are significant. These costs are paid for entirely by the Members of our Club. Sadly, we don't have a magic money tree!

If you're viewing this annoying messsage, you have been identified as a regular non-Member user of our online forum for some time, and we’d really appreciate it if you could give some thought to joining the Club to offset some of the costs mentioned previously.

You can join the Vincent H.R.D. Owners Club, remove this annoying message, and gain full access to all website facilities by CLICKING HERE.

 

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