V7lll stone rear suspension issue |
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Graeme
Falcone Joined: 31 Jul 2018 Location: London Status: Offline Points: 19 |
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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
Senior Member Joined: 19 Jul 2017 Location: UK Status: Offline Points: 127 |
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You might lose some teeth if it's gas charged. Make sure 1st comrade.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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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.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Graeme
Falcone Joined: 31 Jul 2018 Location: London Status: Offline Points: 19 |
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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.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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They haven't stopped selling them Bob, I still use them. |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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BobV7
Senior Member Joined: 20 Nov 2014 Location: W. Sussex Status: Offline Points: 2740 |
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...then I looked at the bikes you've got!
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V7 Classic Black and gold was the best. But green & black was nice too. Now blue is in!
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Graeme
Falcone Joined: 31 Jul 2018 Location: London Status: Offline Points: 19 |
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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
Senior Member Joined: 19 Jul 2017 Location: UK Status: Offline Points: 127 |
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Kayaba stamp their gear KYB. Is that who makes them ?
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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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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Andyb
Senior Member Joined: 02 Jul 2016 Location: Nottinghamshire Status: Offline Points: 602 |
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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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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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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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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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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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