Suspension bushes

[Malc]

Last post on the subject - fitted the new bushes (just needed a bit of heat in the arm and a squeeze in a vice), bolted it all back together, and the play that I had in my rear suspension is now gone.

Happy with that.

Have you a photo of the new bushes fitted in the relay arm please?

[nronketti]

Have you a photo of the new bushes fitted in the relay arm please?

Yup:

[Malc]

Thanks Neil 

[nikster]

Hi Neil,
I too went down the route of using the 18mmx24mmx18mm oilite bushes. Before pressing them into the relay arm, the collars are a nice "slip fit" inside the bush.
However, once the bushes are pressed into the relay arm, the collars don't slip in by hand anymore. I'm sure they'd press in with very little effort, but not sure if they'd end up binding.
So, just before I do that, I thought I'd check with you...

Did you also find this to be the case?

[nronketti]

I too went down the route of using the 18mmx24mmx18mm oilite bushes. Before pressing them into the relay arm, the collars are a nice "slip fit" inside the bush.
However, once the bushes are pressed into the relay arm, the collars don't slip in by hand anymore. I'm sure they'd press in with very little effort, but not sure if they'd end up binding.
So, just before I do that, I thought I'd check with you...

Did you also find this to be the case?

Yup, but my collars were pretty manky anyway, so I just gave them a rub with some emery paper until they slipped nicely in. I did (briefly) think about getting some new ones, but I'm way too tight for that! I know it all sounds like a bit of a horrific bodge, but as long as I remember to slip them out and regrease them every year or so, I reckon it'll be OK. It's certainly 100 times better than it was before with the worn-out plastic bushes.

[nikster]

Thanks for that.
My collars are still in decent condition, so might just have some stainless ones machined to fractionally smaller diameter and keep my others spare.

[kw86er]

I just tore my linkage apart last night. I am going to source and put together a complete rebuild kit for the early 1kt style linkage. Some parts will need to made custom. If anybody else wants in let me know. Also I would like to note that grease should not be used on oilite bushes. I read up on some machinists forum about them and the correct maintenance treatment is to heat them and soak in oil. But generally they are plug and play. I will figure out all the details on this stuff and post my findings.

With a little bit of searching I found that some of the items are available like the seals and needle bearings. I will probably order these parts asap and post where I find them. The bushes are available by oilite and a few other companies. The collars are the part that might need to be made.

I will likely get a few extras made anyway because I am sure the cost will not be much more. Probably pay mostly for set up. But as I said if anybody else would like to rebuild their linkage LMK.

k

[kw86er]

Here is the shopping list. I am updating this list as I go. Please verify numbers and measurements before ordering anything. It's not yet complete.

Parts Diagram http://pure2strokespirit.net/redandblueftp/download/1KT/1KT_2AW_parts_catalogue_jp.pdf

(#) = Parts diagram ref. number.
YAM = Available from Yamaha parts supply
-> # = New part Number

TZR250 BUSHES

(2)  93315-31843 X2 YAM
9331721717 BEARING, CYLINDRICAL

(14) 90387-103N9
COLLAR - ID 10mm, OD 20mm, L 31mm

(15) 90386-20130 - Steel-Backed PTFE Lined Sleeve Bearings http://www.asbbearings.com part# ZU MB2025ZU
BUSH NYLON
ID 20mm, OD 23mm, L 25mm

(16) 1KT-22128-00 X2
THRUST COVER

(19) 90387-123N6 X2
COLLAR - ID 12mm, OD 18mm, L 21.5mm

(20) 23X-22129-00 X2 YAM -> 55K-22129-00-00
THRUST COVER

(21) 93109-18020 X4 YAM
OIL SEAL

(24) 90386-18149 X2
BUSH - ID 18mm, OD 24mm, L 16mm

(26) 90387-103N4
COLLAR - ID 10mm, OD 18mm, L 71mm

[kw86er]

As stated earlier in this thread, ref#20 thrust cover should work fine in the #16 position. The only difference is the #20 has a larger centre hole. I don't see it being a problem. Also my #15 Bush is not nylon it is metal and has a seam. I am reluctant to remove it incase I damage it. Mine seams to be in good shape. If a person was to need to replace it I measured it roughly at ID 20mm, OD 23mm, L 25mm. If you search you can find bushes that match those dimensions but please verify them first.

[kw86er]

Looking at the possibility of using needle bearings I found these for #24

http://www.vxb.com/HK1816-Needle-Bearing-18x24x16-p/kit8630.htm

And these could be place side by side for #15 if a new collar was made at OD 17mm. I am not sure if that is good from an engineering perspective but it would work.

http://www.vxb.com/HK1712-Shell-Type-Needle-Roller-Bearings-17x23x12-p/hk1712.htm

[kw86er]

So I have ordered everything that can be. I am going to try to use the above mentioned needle bearings.

I need collars #19 and #26

I am going to a local machine shop this week to see what they can do for me.

[kw86er]

I believe that the #15 bearing used in my linkage is what is called a Dry Bearing or Plain Bearing. It is steel and has some coating on it.  I am not going to mess around with changing this as the collar is in good shape, has a tight fit and moves freely. But this information might get somebody moving in the right direction in the future.

Edit The correct ones should be "Steel-Backed PTFE Lined Sleeve Bearings" I believe.

Found here http://www.asbbearings.com part# ZU MB2025ZU



It looks like these.

[kw86er]

For the collars to work with needle bearings they need to be hardened and ground. That would make it easier to use the Oilite bearings for the #19 collar but the #26 collar goes inside needle bearings. Mine is pitted and you can actually see the roller marks in it so it will need to be replaced. With a little further research I found that you can buy inner rings for needle bearings.

Part# IRT1519 is ID15mm, OD18mm, L19.5 and should work with #19 collar if we adjust the OD to 15mm.
Part# IRT1525 is ID15mm, OD18mm, L25.5 and could be fitted the #26 collar with some machining.

I will bring this plan to my machinist and see what he thinks.

[kw86er]

I talked to the machinist today and he said to order the inner rings because the the process of hardening isn't worth it for a couple pieces. So I will order those up today and bring it all to him when everything arrives.

[jools]

Just wondering whether hard chroming of the original pins would be a possibility - similar to getting fork stanchions re-chromed ??