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 New Hagon rear shocks jacked up and centre stand mod

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New Hagon rear shocks jacked up and centre stand mod Empty
PostSubject: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeWed Apr 04, 2018 12:57 pm

So I'm finally getting my arse in gear and doing a dedicated write up on my rear suspension modifications, rather than leaving scattered recommendations wherever I go!

Into:
When I got my mint low mile Swing back in October, the two biggest negatives I had were firstly the ridiculous amount of effort required to get the bike on/off the centre stand. It really was hard, and once up, it would slam back down on the stoppers. It might seem silly, but it was enough of a faff to put me use using the bike if another was available. Next, was the heavy steering, and especially how after about half-lock it would suddenly start pulling hard towards full-lock and with several times more force that was required to steer it prior to that, such that it really caught you out. This made low-speed tight turns difficult bordering on dangerous for me, such as pulling out of parking spaces or turning at junctions. It was even worse when the wife was on the back, and she's tiny! This is because of the rearward offset of the wheel contact patch relative to the point the actual fork angle points to on the floor. Imagine the forks held vertical (so only a tiny offset due to the offset axle mounts). As you rotate the forks, the wheel would steer normally, because the contact patch remains almost under the axis of the forks. Now imagine the forks laid right back, almost flat. The line of the forks would reach the floor some way out in front, but the wheel touches the floor in the usual place, so the offset between this two points is huge. Now imagine rotating the forks... the contact patch of the tyre with the floor would end up off to one side of the axis of the forks, hence it would try to fall over. This is what happens during tight turns, and what I want to reduce on my bike. Since I can't move the axle mounts, I'll try to steepen the angle of the forks to reduce that offset.

These two issues combined made the bike unpleasant to use, an I would tend to use others instead, which defeated the idea of getting the Swing in the first place.

Centre Stand:
I looked to sort the entre stand first as this was a cheap fix. This was done by restricting how far forward the stand could move after passing the vertical, and hence limiting how far the bike could move back and drop once going past the balance point. This would at least make it easier to get it off the stand. A quick look showed that the stoppers were wide and flat, and a test with some 5 gram wheel-weights worked nicely. Not wanting to worry about the weights falling off while riding (since usually on wheels centrifugal force will press them in place), I opted to made some bent metal brackets to fit around the fork legs without damaging them. I acquired some 3mm thick aerospace grade stainless flat, about 20mm wide and 100mm long, and then attempted to bend them into a U shape.
I say attempted. Boy is that stuff strong. I ended up having to use a blow torch to get the middle of the metal glowing a dull red in order to bend it in a vice having started it off with a 3lb lump hammer. Next time I'll make a tool and use a 10T press at work! Having done this I drilled a 5.5mm hole through the steel, then tapped one side M6 (5.5mm drilled for ease of tapping, I know it should be closer to 5mm), and drilled the other 6.5mm for clearance. Once the bracket were in place I clamped them on with an M6 bolt, and added a jam nut for security. The bike now sit a lot higher on the stand which makes it easier to get off, but not on - this was all part of the cunning plan.

New Hagon rear shocks jacked up and centre stand mod Dscf6215


First lessons:
The mod works, but it's too much faff. Don't bother with the brackets. Just file the paint off the stops and flatten the surface (it's made of two plates side by side, so it a tad uneven) then use a stick on wheel weight. Keep a couple of spare in the glove box or tool bag just in case.

Ride height test:
I opted to test how a increase in ride height could improve the centre stand action. I used various thicknesses of planks under the rear wheel to simulate increased ride height, and then tried a) sitting on the bike, and b) getting it on/off the stand. The results were promising: even my short legs could still reach the floor easily, and the stand action was much MUCH easier, now on par with my little 125cc scooter which was over 200lbs lighter! I made a note of how much clearance I had under the wheel (about 25-27mm) and hence how much I could jack up the rear shocks - 22mm was my target.

Rear suspension:
I looked at various options: Hagons (cheap, local, but 3-step preload only), Ikons (mid priced, but some more adjustments), and Wilbers I think (full price, full adjustment). But following a chat with Dave Bulwell at Hagon (he's sound, a great guy), I opted to go with Hagon. Again. I've used custom shocks from them twice before, so opted for reliability over fancy features. Dave explained that the Swing shocks were the longest by far of any they made, and as a result custom length were not an option since everything was bespoke to the Swing. Damper, spring, bottom clevis mount. All bespoke. Having bounced some ideas around, we agreed that while a new clevis would be a elegant solution, it was too costly for an unproven idea. So we decided to let me bodge a pair of stock items! The next morning the Hagons arrived at home for me to play with.

Normal length Hagons:
I had done some sag testing with the stock shocks, and repeated it with the Hagons. Recall that my bike was low miles, so the stock shocks can hardly be considered worn out (4,000 miles). I won't bore you all more with all the figures, but the bike sagged about 1.5" when the weight came off the centre stand on onto the back wheel (this excludes the air gap under the wheel), and sagged about a further 1.5" with me sat on it, to give a total over 3". Changing to the Hagons, that total sag with the rider dropped to 2", maybe a tiny bit less. So that was a 1" increase in rear ride height just from the stiffer springs and correct pre-load.

Jacked up Hagons:
I then opted to strip the shocks down, and implement my cunning plan. The springs were compressed using 6 big cable ties each to give me enough space to slip the retainers out and disassemble the unit. The next step was to unscrew the alloy clevis from the damper rod. Dave had explained it was simply loctited on, so first I tried immersing the clevis (not the damper!) in boiling water. No joy. Next I gently clamped the damper is a wooden work bench and began heating the alloy with the trusty blow torch. To warn me if I was over heating the alloy, I place a snip of solder on the clevis. If that melted, I'd know I was getting too hot (170deg C) for the alloy. It didn't melt. Eventually the Loctite (blue it turned out) softened enough to allow the clevis to unscrew. After cleaning the cleaning the threads, I set about the mods. The aim was to allow the shocks to be returned to normal later if desired.

New Hagon rear shocks jacked up and centre stand mod Normal10


As can be seen, the rod sits in the clevis hole, and is retained by a threaded section midway down the hole, which is about 35mm deep in total. The insertion depth is set by the rod bottoming out, with the end of the rod necked down to a) clear the threads and b) ensure that it sits fit, not on any radius edge at the base of the hole. I opted to increase the length by inserting a 22mm steel dowel. I think that I used the smoother shank of an old 10mm drill bit trimmed to length on the angle grinder. It was  few months back now! But this would mean that the threads wouldn't meet. So I purchased some M12 fine thread inserts to fit to the top of the clevis. By luck these are common for repairing diesel injector holes, hence kits were cheap. I got two kits on special offer complete with special taps for £1.75 including post! Or something like that. The special dies cut their own hole and then tapped it for the insert. I filed two opposite flats on the flange of the inserts to ease removal later if needed. The inserts would be loctited in place, and then the rods loctited into them, while sitting on top of the dowels. This would give about 10mm of thread engagement (compared to 15mm as originally built), but since the shock would only be in tension if I were to jump the bike (!) I reasoned that this would not be an issue.


New Hagon rear shocks jacked up and centre stand mod Modded10


But this left the issue of spring preload. Or lack of. Or even spring contact. Or lack of! I made up an alloy spacer the same 22mm thickness as the dowels, in order to return the preload to the original Hagon setting. There was a 13mm clearance hole for the rod, a rebate to clear the flange of the thread insert, and a step on the top to locate the spring. Now, the picture shows a one piece unit, which is what I would have like to have made. If only. I don't own a lathe, but the maintenance boys at work have a basic one with a few tips. So I took an hour to two of 'personal development time' to use make use of it (ok, I skived off work!). But with limited tools, I was only able to turn up the main discs, without the rebate, without the hole, and without the step. Nor material to make the step so it seems. But they were the right thickness (22mm) and the right diameter to match the clevis (47mm I think). At home I drilled the centre hole, and used a flat wood bit (!) to cut the rebate on my bench drill. I then made the step. This would be from a separate disc with centre hole, which would be bolted down onto the main space body. But I didn't have any 5mm allow sheet. What I had was 1/2" plate. Sigh. So I cut out the right size disc with a hole saw, locked it onto a long bolt with a couple of jam nuts, then literally chucked it in the bench drill. I turned it to final size to fit inside the spring using a file pressed against it. I then split it in half in plane using a hack sack while the disc span in the drill. I know, I know, but means must when the devil drives so they say. The result was two discs 5mm thick, with a central hole 13mm, and an out diameter to fit inside the spring. The last task was to drill a small 5mm hole in the step disc, then mount it onto the spacer disc on the rod, and mark where the hole was on the spacer disc. This was then drilled and tapped M5 to take a small button-head bolt to hold the two discs together. Since its only job is to centrally locate the spring, and the discs themselves are located by the rod, that one bolt is sufficient since all it does it stop the step disc falling off! If you look closely at the pic you might spot the little bolt inside the spring!
Phew. Not ideal, but where there's a will (but not a fully equipped lathe) there's a way.

New Hagon rear shocks jacked up and centre stand mod Dscf6216

While I had the shock apart, I opted to polish up and lube the mating and moving faces of the spring and preload adjustment collate, to make it easier to turn. The collar is a zinc casting and has a few burrs and edges than respond well to being rounded off.
After assembly, everything looked good, and left me with about 5mm clearance between the tyre and the floor when on the stand. It's a new tyre, so this gap should only increase when it wears.

Fitting note:
When fitting/removing the shocks, it is in fact possible to access the top bolt without stripping off the panels or drilling holes in the luggage compartment. A ring spanner with an offset head can just about get up there and do the business. That said, once you've done it once, removing the side panels isn't difficult. Remove the rear rack (4x bolts), remove the little panel between the licence plate and the stop lamp (2 screws), remove the screws from the side panels (two on the right, three on the left). Pull out on the bottom of the panel to clear the lugs from their holes, the lift the top of the panel up out of its slits in the edge of the luggage compartment. I find getting pulling with a finger in the holes left by the front of the rear rack helps get this last bit going. For the left panel disconnect the seat lock cable if you want to move the panel away from the bike.

Result:
Firstly, the bike is a doddle to get on and off the stand, since now it sits most of the way to the top as it were. Just need to exercise a little common sense when parking on slopes. It won't roll off on it's own, but it might if some nonce bumped into it. But this is hardly different to other bikes, or to use of the kick stand for that matter.
Secondly, the firm rear suspension improves the ride a lot. It doesn't wallow or bounce along. Preload is easy to adjust too.
Thirdly, the steering is GREATLY improved. While there still is that tendency to flop into tight turns, the forces involved are much less. This is because the rear end is higher, hence the fork angle is steep, hence that rearward offset of the wheel contact patch relative to the point the actual fork angle points to is also less. Now those steering forces are on par or less than the usual steering forces, hence it doesn't catch me out. I find I can do tight turns easily without feeling like the bike is trying to yank the bars around. To my mind it now handles like a heavy classic motorcycle (Ninja 900 maybe?) rather than some raked out cruiser made for show and not for corners.

Conclusion:
The firmer and taller rear suspension improves the ride and handling which makes the bike easier and more pleasant to ride. This does require some mods to the lower end of the shocks, but a simple change to the clevis design (a 22mm stretch between the bolt eyes at the bottom and the bottom of the rod hole) would make this a factory option from Hagon. This mod does though require a reversible mode to the centre stand. For home builders I would recommend adhesive wheel weights, but for Hagon I would use my method, but with some properly pressed steel U clamps.


So much for a quick write up!
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The Bern
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeWed Apr 04, 2018 3:09 pm

thumbs up Nicely done bud thumbs up
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeTue Apr 24, 2018 7:06 pm

I totally agree with you on the handling of the SW. I have a Vstrom 1000 also and the difference in the way the 2 bikes handle is huge. I really notice it when I get off of the vstrom and right onto the Wing. Ya, tight u turns are scary. And on tight sweepers, the Wing wants to fall to the inside making you roll off the throttle, straighten it up, then get back into it.
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gavinfdavies
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeWed Apr 25, 2018 12:40 pm

Handles beaut now. Although it does revert some what with luggage and the wife on the back. But still not too bad. I'm eating away at my chicken strips.
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeTue Sep 17, 2019 11:26 am

I reached the "limit" of getting my Chicken Strips off when I bottomed the centre stand out on the right hand side.

I was thinking, raise the rear a bit to sort that out...

So this is indeed a timely thread to come along.

It was suggested I remove the centre stand. But how the heck do you do any work on the rear end then?
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeThu Sep 19, 2019 2:31 pm

I just don't understand people having trouble putting a Swing on the center stand. I can do it with just two fingers. Now if you've worked in an office most of your life it is understandable.
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeThu Sep 19, 2019 7:14 pm

I weigh 140 lbs and at 69 years I am able to put my Swing on/off the center stand. Sit on it and rock it forward holding the brake when it falls off the stand. The trick on putting it on the center stand is to first make sure both legs of the stand are in contact with the ground. Gripping the left handle grip and the side rails, stand down hard on the arm of the stand using the side rails for leverage. The bike will rock backwards on to the stand.
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PostSubject: The last stand   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeSun May 17, 2020 2:52 pm

The centerstand is kinda sucky on the SW. I have gotten used to it. The centerstand on a Burgman 650 is very sucky and I never did get used to it.
The kickstand on the SW is a might short however. It seems it needs about an inch (you could make a joke but we all own the same kickstand). I will be adding probably a large nut and a plate to correct it.
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeSun May 17, 2020 3:04 pm

Hiyo wrote:
[Snip] The kickstand on the SW is a might short however. It seems it needs about an inch (you could make a joke but we all own the same kickstand). I will be adding probably a large nut and a plate to correct it.

Yes, if you’ve changed to Hagon rear shocks which are taller (or a taller rear tire) then you’ll probably want to increase the side stand height. But do be aware that the side stand foot does kinda fit into a pocket in the side skirt and a longer side stand may result in a hole in or broken tupperware at that location.

And if you haven’t changed to taller shocks then lengthening the side stand may well result in the Silverwing standing precariously close to vertical when parked.  

Tim
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeSun May 17, 2020 4:24 pm

Hiyo, my husband put a 3/4 inch piece of wood on the bottom of the side stand foot. Just screwed it in. Painted it black. I also had the Hagon shocks. Worked great. It lasts a couple of years he replaced it once.

Hope this helps.

Cathy
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeSun May 17, 2020 6:24 pm

The bike hung way low with a sacked front end. I have since rebuilt it with factory springs and Royal Purple power steering fluid with anti foaming agents 20wt., new seals too. It sits about the same. My rear shocks are stock, they don't leak, so they are staying. It handles great. I have thought about alternative materials for the kickstand extension. I think I could sculpt it to fit the nook. I will keep everyone posted. 🤨
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeMon May 18, 2020 1:34 am

Have a poke around on eBay or online for a sidestand/kickstand foot for the Silver Wing. Loads are advertised for Japanese motorcycles and scooters.

They're inexpensive CNC adonised alloy ones made in China that slip over the sidestand foot and are secured by three or four screws. This gives a larger area of sidestand foot, and the scooter leans over about half an inch less.

You also might have better luck than I did buying one for my 2018 Forza.

The first one I purchased, one of the two halves wasn’t machined at all to fit the Forza's sidestand and I couldn't sandwich it together. So I took photos and contacted the seller explaining their cock up. They took that on board and I got a refund. Neither did I have to send the faulty one back.

Undeterred I bought a different design. On this one the top enveloped the sidestand foot and the base secured it,  Bingo!  Well not exactly, the top should have covered and wrapped round the stand a lot more snugly and the Forza's weight pressing on it tended to spring it loose.

I remember discovering the foot missing after going back to my Forza after pie and mash in the Yorkshire Dales, and ever the optimist thinking I might spot it somewhere by the side of the road on the ride back home.

When I got back home it was there outside my garage having dropped off when I raised the sidestand to set off. A couple of double sided adhesive pads seemed to do the trick and all was well for a few months.

Then I noticed it had dropped off again when I was touring in France last year, and by then I was past caring.
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PostSubject: Re: New Hagon rear shocks jacked up and centre stand mod   New Hagon rear shocks jacked up and centre stand mod I_icon_minitimeMon May 18, 2020 9:02 am

Tried looking there a while ago. The stands looked great and I thought I would try it later as it was down on the list of things to do for Sw.. The credit card is in dispute over the last purchase I made from China, so the welding shop or garage spares as you would say will likely produce something that I can adapt.
I have been to Europe and drove (would rather have rode) from the Schwarzwald to Switzerland. Most of the time I was wishing I was on two wheels.
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