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V7lll stone rear suspension issue

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Graeme View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graeme Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2018 at 17:59
 I’ve just picked up a friend from the station on my motorbike.

Suspension seems to be much better two up on the bike.

At bottom of the suspension unit there is a what looks like a brass Drainhole?

I don’t think they are sealed units? Also I do not think they’ll gas charged?

Once the The spring is off the dumper, I assume it is bi-directional dumping.?

Pain in my lower back suggests it is. Hopefully no internal return spring.

Drain into a measuring jug, replace with a syringe with lighter oil. & maybe 1/5th less oil.

Dry and Threadlock drain screw back in. I have proved  Haynes Manual,s wrong before.

What have I got to lose apart from my dignity.?

.

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Adam View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adam Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2018 at 21:28
You might lose some teeth if it's gas charged. Make sure 1st comrade. 
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2018 at 22:21
Also how would you know the weight of the oil which comes out to be able to replace it with a lighter grade?
And I wouldn't put less back in, that alone could cause problems. It goes without saying both dampers must be identical.
Brian.

Better 5 minutes late in this world than years early in the next.
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Graeme View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graeme Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2018 at 23:21
ill compare the OM oil with the a new bottle of the  finest fork oil Just one method amongst many  syringe test  capillaries test  viscosity test  or just plain and simple  how it feels between your fingers .  I have changed fork coil before  and the joy of fork seals.  As for the amount of oil,  as long there is Oil volume to 
Loob the oil seal piston and  internal bush.  They are old school  no exotic gases.  No Schraeder valve, no signs of them being anything but  atmospheric pressure.  Obviously I will  invert them  before I loosen the skrew  gingerly.  Only the brave.






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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 07 Aug 2018 at 00:39
Originally posted by BobV7 BobV7 wrote:

Dunno what you're looking for in a tyre but bikes haven't had "soft" side walls for decades, probably not since they stopped selling Avon Speedmasters.

They haven't stopped selling them Bob, I still use them.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BobV7 Quote  Post ReplyReply Direct Link To This Post Posted: 07 Aug 2018 at 07:32
Shocked...then I looked at the bikes you've got!
V7 Classic Black and gold was the best. But green & black was nice too. Now blue is in!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Graeme Quote  Post ReplyReply Direct Link To This Post Posted: 07 Aug 2018 at 22:22
v7lll stone OM rear skocks ar made by “K.Y.B. Corporation”.
Thay have a gas  charge.  The only thing that can be changed is the oil. The gas doesn’t  pressurise the oil. The oil  pressurises the gas under shock loading. “Of course this is all speculation “


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Adam View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Adam Quote  Post ReplyReply Direct Link To This Post Posted: 08 Aug 2018 at 06:34
Kayaba stamp their gear KYB. Is that who makes them ? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2018 at 17:59
Having ridden the V7.iii and the V7.ii on Pirelli Sport Demon, I'm having my V7.ii Stone shod with Avon AM26 Roadrider (bias ply) which I've been riding on for the past three years on the Enfield. They're a popular upgrade on Bonnies too. I was completely underwhelmed by the Pirelli skittering about on dry roads. I've never had that with the Avon even in the wet, nor tram-lining on a roadworks patch. They're more of an all-weather commuter tyre than sports.

(update) I've just looked up tyre pressure on the Avon (USA) website for V7 (all), they recommend  Roadrider at F33/R36psi. Same sizes, same load rating but with higher "V" speed rating.

This may help the rear suspension. These tyres do not feel as 'hard' as Pirelli. At 18 stone I always have to muck about with the preload. I normally add an extra psi or so to bike tyres due to my extra weight. I like it as soft as possible before it bottoms out on bumps.


Edited by jefrs - 12 Aug 2018 at 19:34
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Andyb Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2018 at 22:19
I have had bias Roadriders on my BMW R100R.  20% more life than other tyres.  But not a sporty tyre.  On my V7 I now have a radial Pirelli Scorpion Trail on the rear, and will fit one on the front when the Sport Demon wears out...radial tyres are much better than bias tyres IMHO.
AndyB
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 2018 at 22:25
Originally posted by BobV7 BobV7 wrote:

Shocked...then I looked at the bikes you've got!

TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 13 Aug 2018 at 15:41
Just ridden ~50 miles on brand new Avon Roadriders (i.e. not at their best yet) and the tram-lining and skipping of the Pirelli Sport Demons has gone. V7.ii Stone. Very confident.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jefrs Quote  Post ReplyReply Direct Link To This Post Posted: 14 Aug 2018 at 14:07
Originally posted by Andyb Andyb wrote:

I have had bias Roadriders on my BMW R100R.  20% more life than other tyres.  But not a sporty tyre.  On my V7 I now have a radial Pirelli Scorpion Trail on the rear, and will fit one on the front when the Sport Demon wears out...radial tyres are much better than bias tyres IMHO.
AndyB


Andy - the Sport Demons are not radial, they're what Pirelli call X-Ply, they're a bias ply. Some bikes like the Bonnie only like a radial on the back and hate them on the front. Not entirely sure what bias the Scorpion is, Pirelli don't say but they're an enduro tyre and have to be reasonably stiff sideways.

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