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Swing arm Movement? - Printable Version

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Re: Swing arm Movement? - WayneUK - 03-08-20

(03-08-20, 07:18 PM)b1k3rdude link Wrote: Gnasher will correct me where Im wrong or am bike agnostic -

But that could be the swing arm bearing, one of the bearings in the suspension linkages, or possibly even a rear wheel bearing. When you say you have up/down play how are you seeing/feeling this..? When an MOT tester checks all of the above for free-play, they stand behind the bike and put both hands on the rim of the rear wheel and gently but firmly pull upwards a few times. And as others have asked, how much free play are you seeing/feeling? If the movement is almost imperceptible, then that's most likely an MOT advisory. But back to narrowing down where the play is -
  • If you haven't done so already the first thing to so is remove the rear wheel, then with the sprocket carrier and axel in-place put your knee/chest on the top of the wheel and again pully gently but firmly on the axel and check for free-play - there should be none that you can feel, if there is you should replace all the wheel bearing as you can replace just one (good pattern bearings are cheap enough now)
  • When the rear wheel out same as before grab the ends of the swing-arm and check for free-play. If you feel any its either a linkage bearing or swing-arm bearing.
  • Remove the suspension linkage and using the bolts that go through the roller bearing check for lateral movement, as in up/down or diagonally. If there is any movement the bearings and/or the bolts will need to be replaced. Note - I think the bearings in the linkage may need to be pressed out and new ones pressed in, but don't quote me on this.
  • If your wheel bearings and your suspension linkage bearings are fine, then that only leave the swing arm bearings. The only test I can think that 'might' show wear is to hold both arms and try a gently but firm twisting motion. If there is any free-play then replace the bearing and check the swing-arm excel for wear.
It looks like the suspension linkage, I'll do a video tomorrow of it moving if this would help?


Re: Swing arm Movement? - b1k3rdude - 03-08-20

Sure, but I think we will only able to see any play if its 'really' bad. If its just normal wear that requires replacement of any of the bearings you will mostly likely only be able to feel this and not see it.

Re: Swing arm Movement? - WayneUK - 03-08-20

(03-08-20, 07:31 PM)b1k3rdude link Wrote: Sure, but I think we will only able to see any play if its 'really' bad. If its just normal wear that requires replacement of any of the bearings you will mostly likely only be able to feel this and not see it.
You can see it moving as I have had someone to move it up and down while I had a look


Re: Swing arm Movement? - Gnasher - 03-08-20

If you grab the end of the swingarm and lift it will move slightly about 1-2mm that's normal.  If it's knocking so you can hear it and moves more than 2mm but less than 4mm it's more than likely the bearings need repacking and/or the seals on the linkages have failed. 

It's all about tolerance and there must be some play to allow for the grease, they're 4 bearings if each has 0.5 that's 2mm at the end of the swingarm. Most cases they just need repacking and the seals replacing, these are 12k service items, often not done.  You'll have to check each bearing and pin for wear, if they're gritty, rusted, damaged (the needles drop out as you remove the pins) or there's more than 0.5mm play without repacking with grease, they're shot.

Re: Swing arm Movement? - b1k3rdude - 03-08-20

@Gnasher, can the bearing in the linkage arm be pushed out with your fingers..? or is a press-out, press-in affair..?

Re: Swing arm Movement? - Gnasher - 03-08-20

(03-08-20, 09:37 PM)b1k3rdude link Wrote: @Gnasher, can the bearing in the linkage arm be pushed out with your fingers..? or is a press-out, press-in affair..?


Press in/out they're slight interference fit, they don't require high press weights. 

Re: Swing arm Movement? - WayneUK - 04-08-20

Done a video of it, hope it works ok?
https://www.amazon.co.uk/photos/share/MIjuq6Qm9CwbeOokeyVi8Siia0GWTtCsf9klOdGOpLn

Re: Swing arm Movement? - b1k3rdude - 04-08-20

That to me looks like 1-2mm or less, so the bearing just need repacking. Lets see what Gnasher says.

Re: Swing arm Movement? - Gnasher - 04-08-20

(04-08-20, 01:21 PM)b1k3rdude link Wrote: That to me looks like 1-2mm or less, so the bearing just need repacking.

Mate that's overall movement at the end of the swingarm.

The bearing in the vid looks buggered, it also very likely the pin is too, probably due to seal failure.

Re: Swing arm Movement? - WayneUK - 04-08-20

(04-08-20, 01:40 PM)Gnasher link Wrote: [quote author=b1k3rdude link=topic=26394.msg318730#msg318730 date=1596543713]
That to me looks like 1-2mm or less, so the bearing just need repacking.

Mate that's overall movement at the end of the swingarm.

The bearing in the vid looks buggered, it also very likely the pin is too, probably due to seal failure.
[/quote]
Ive ordered a used rear shock linkage, do you think I will need a new bolt and collar too?


Re: Swing arm Movement? - Gnasher - 04-08-20

It's impossible to say without stripping it.  It's also very possible the bearings in your second hand part will be shot too, but you could be lucky and the pin/bush (collar) in the bike could also be worn. 

Re: Swing arm Movement? - WayneUK - 04-08-20

Do you know where I could get the seals No.24 and collar No.17 from as fowlers don't have them in stock?

Re: Swing arm Movement? - b1k3rdude - 04-08-20

(04-08-20, 01:40 PM)Gnasher link Wrote: Mate that's overall movement at the end of the swingarm.
Ah yes, doh.


Re: Swing arm Movement? - b1k3rdude - 04-08-20

(04-08-20, 02:46 PM)WayneUK link Wrote: Do you know where I could get the seals No.24 and collar No.17 from as fowlers don't have them in stock?
Call/email all your local yam dealers and see if any have stock.

or

Do a search on ebay for the part number -


Re: Swing arm Movement? - FILZ6 - 04-08-20

Try Wemoto, or Yambits.  Smile

Re: Swing arm Movement? - WayneUK - 04-08-20

(04-08-20, 04:51 PM)FILZ6 link Wrote: Try Wemoto, or Yambits.  Smile
Tried them they don't do them


Re: Swing arm Movement? - Gnasher - 04-08-20

I think you'll find OE part only, you'll have to order from a dealer.

Re: Swing arm Movement? - FILZ6 - 04-08-20

Wemoto.com are showing the seals in stock, £5.62 + £3.00 postage to the UK.  Looks like the collar is out of stock though.

Re: Swing arm Movement? - Gnasher - 04-08-20

(04-08-20, 06:06 PM)FILZ6 link Wrote: Wemoto.com are showing the seals in stock, £5.62 + £3.00 postage to the UK.  Looks like the collar is out of stock though.

Never known them to carry this part or any specific suspension part other than front fork seals and bushes , I can't find the oil seal he needs or the collar he may need? 

Bearings yes, but I wouldn't use them, they're a 3rd of the cost for a reason, but that's up to you. 

Followers will get most parts, on back order within 24 hrs, might take a little longer due to Covid. 

Re: Swing arm Movement? - robbo - 04-08-20

Have you tried the firm I suggested for your sump washer. MSP.