Fork oil |
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paulrob100
Senior Member Joined: 22 Feb 2018 Location: Nottingham Status: Offline Points: 124 |
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Posted: 04 Jan 2019 at 20:22 |
Hi guys.
Can anyone tell me the best way to re-fill the forks on my V50 mk2 Thanks, Paul
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George S
Senior Member Joined: 31 Mar 2018 Location: Essex UK Status: Offline Points: 643 |
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There is a drain screw at bottom of fork at rear
Filler allen screw is at top of fork. You might have to move handlebar. Add 0.07 Lt oil to each leg. Guzzi manual recommends Agip F1 ATF Dexron other oils available.
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George
1994 Nevada 1962 Lightweight ducati Bevel Single Son's 1990 1000S to borrow any time |
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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If I remember correctly* the oil in V50 forks is only for lubrication and damping is handled by a sealed damper unit. *I'm sure someone will correct me if I don't......
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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George S
Senior Member Joined: 31 Mar 2018 Location: Essex UK Status: Offline Points: 643 |
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Don't think there is a sealed damper in mk2
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George
1994 Nevada 1962 Lightweight ducati Bevel Single Son's 1990 1000S to borrow any time |
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DaveW
Guzzino Joined: 03 Dec 2016 Location: Scotland Status: Offline Points: 5 |
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The V50 Mk 2 has sealed cartridge dampers. (I replaced mine a couple of years ago.) The fork oil is just for lubrication, not for damping.
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paulrob100
Senior Member Joined: 22 Feb 2018 Location: Nottingham Status: Offline Points: 124 |
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Thanks for the replies.
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GC888
Senior Member Joined: 21 Dec 2015 Location: Manchester UK Status: Offline Points: 174 |
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Yes they have oil for lubrication only & they do have damper cartridges on the Mk11.
Having sorted mine I would recommend stripping them down to clean out the old gunge accumulated from the 80s till now. Mine were in quite bad shape so had the stanchion re-plated and fitted new seals. But is a very simple construction. Filling - is an ass of a job as you need to add it down the side of the cartridge! removing the plug on the top will not work as normal, I would suggest listening the station in the yoke removing the top plug and sliding the stanchion down the cartridge a little to make a gap between the inner wall of the station and the cartridge. Then take your time to drip in the oil wiggling as you go to remove air locks (I used a syringe) Measure what you spill in a catch tray as you will spill some! I would suggest a bit of sealant on the drain plugs and mounting bolt at the bottom of the slider when reassembling. |
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TheWrongTrousers
Senior Member Joined: 05 Nov 2018 Location: Somerset Status: Offline Points: 658 |
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I am in the middle of tidying up the forks on my LM1. I heartily agree with GC888 when he says its a good idea to strip them down and remove all the old grunge. It was really horrendous and I am very glad I did it. The question I have is whether some left over 10w fork oil would be ok to put in the forks. I realise that the damping is already taken care of by the sealed units, so I would have thought that my fork oil can do that as well as anything else. Is it really necessary to go out and buy this Agip Dexron stuff ?
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red leader one
Senior Member Joined: 07 Oct 2014 Location: Cullercoats Status: Offline Points: 4466 |
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Would you spoil a ship for a ha'porth of tar?
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TheWrongTrousers
Senior Member Joined: 05 Nov 2018 Location: Somerset Status: Offline Points: 658 |
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Noooo of course I wouldn't, but I suppose my question was whether fork oil would spoil the ship. Will something bad happen if I put fork oil in it ? Does anyone know ?
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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If I remember rightly it's Automatic Transmission Fluid (ATF), as it's for lubrication only. Do not the fork leg top caps unscrew on the MK2? On the MK1 I took the centre Allen bolt out, it attaches the top end of the damper; then unscrew the top cap (on the MK1 needs a BIG Allen key, I ended up using an hex socket which I could use a long socket set bar on, can be tight). With that off, oil can be poured in normally no problem. A correct measured amount of course. Also desirable to help all the old to drain out. Not a good idea to take both leg caps off at the same time, without something holding the sump up, else bike will fall foward and the dampers come out the top. |
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"Chicken nuggets don't dance on a Tuesday."
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TheWrongTrousers
Senior Member Joined: 05 Nov 2018 Location: Somerset Status: Offline Points: 658 |
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I wonder how you know that Mike ... ?
Mine has both forks off and is currently supported by a very sturdy square plant pot under the sump. So, will 10W fork oil cause problems if I were to use that instead of ATF ?
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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Yes, I managed to do that once. Amazing how far you can reach when you try, one hand holding the bike vertical as it also rolled off the stand, the other reaching for something to prop it up.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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GC888
Senior Member Joined: 21 Dec 2015 Location: Manchester UK Status: Offline Points: 174 |
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Yes its a bad idea
The auto transmission fluid is much thinner and is less likely to act as a damper
The design is that it splashes around lubricating but nothing more. If that was the full story you could just get away with using a very high quality fully synthetic 0-20 engine oil.... But don't - Engine oil has the ability to absorb water and release it when hot - the forks will never get hot so over time the oil will fail (the absorption seen in extreme cases is the mayonnaise you get when a head gasket leaks) In normal temperatures 0-20 has a higher viscosity than the thickest ATF the thinner ATF has an even lower viscosity. Normal fork oil at around 10 will still act to hydraulically damp the fork, I think it will be away off locking it but as ATF is not expensive why chance it .... |
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TheWrongTrousers
Senior Member Joined: 05 Nov 2018 Location: Somerset Status: Offline Points: 658 |
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Dear GC888. All I have sought to do is to understand the difference that ATF would make. You have explained it perfectly and I am grateful to you. In future nothing other than the finest ATF will enter my front end, as it were.
My thanks to other contributors who also took the trouble to reply.
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