How do you change the Cush?

Squeaky back brake? Hard to control at 30mph/40kph?
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JimmyDean
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How do you change the Cush?

Post by JimmyDean » Fri Sep 07, 2012 3:41 am

my 'tard was on the rear stand and while in gear I was able to turn the wheel, with a clunk sound, back and forth about an 8th of an inch. Looking at the cush's they are a little worn so I ordered new ones. My question is how the hell do you change them? I tried a blind puller=no dice.
my rides:
2010 SMT (aka Tard)
2011 SX-F 350 (aka KaTyM)
2006 Speed Triple (aka the BAMF)
1981 Blonde (aka Yummy)

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alien
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Re: How do you change the Cush?

Post by alien » Fri Sep 07, 2012 4:52 pm

Place wheel on some blocks of wood with the sprocket facing the ground and bit of cloth below sprocket. hit sprocket form behind using a piece of wood and a hammer working your way round the sprocket. Have changed a few cush drive rubbers always very tight first time you try to remove sprocket and carrier.
"It is how we weather the storm that shows character and spirit. Enjoy the calm and show mastery in the circumstances of life "

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Re: How do you change the Cush?

Post by JimmyDean » Wed Sep 12, 2012 7:14 pm

Huh? That really didn't make any sense to me.
my rides:
2010 SMT (aka Tard)
2011 SX-F 350 (aka KaTyM)
2006 Speed Triple (aka the BAMF)
1981 Blonde (aka Yummy)

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alien
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Re: How do you change the Cush?

Post by alien » Wed Sep 12, 2012 8:02 pm

Remove wheel

Place the wheel on 2 blocks of wood with the sprocket facing the up. Kneel on the wheel. Grab sprocket with both hands either side (wear gloves) Pull the sprocket up trying to wiggle it as you pull.

If it is too tight and will not move. Turn the wheel over so sprocket is facing the ground, but not touching the ground in the gap between wooden blocks. Use a piece of wood between the spokes against the back of the sprocket. Tap this with a hammer working your way around the sprocket between the spokes. This should loosen it enough to allow you to remove it by hand.
"It is how we weather the storm that shows character and spirit. Enjoy the calm and show mastery in the circumstances of life "

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alien
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Re: How do you change the Cush?

Post by alien » Wed Sep 12, 2012 8:02 pm

Remove wheel

Place the wheel on 2 blocks of wood with the sprocket facing the up. Kneel on the wheel. Grab sprocket with both hands either side (wear gloves) Pull the sprocket up trying to wiggle it as you pull.

If it is too tight and will not move. Turn the wheel over so sprocket is facing the ground, but not touching the ground in the gap between wooden blocks. Use a piece of wood between the spokes against the back of the sprocket. Tap this with a hammer working your way around the sprocket between the spokes. This should loosen it enough to allow you to remove it by hand.

Like this but with sprocket facing the ground

Image
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milq
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Re: How do you change the Cush?

Post by milq » Thu Sep 13, 2012 4:25 am

I think Jimmy is asking how to replace the actual rubber units on the sprocket carrier.

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alien
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Re: How do you change the Cush?

Post by alien » Thu Sep 13, 2012 6:54 pm

milq wrote:I think Jimmy is asking how to replace the actual rubber units on the sprocket carrier.
Once you remove sprocket and carrier as discribed above. You just lift the cush drive rubber out and replace with new ones. They just sit in the hub, not fixed in anyway.
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Re: How do you change the Cush?

Post by matejs » Thu Sep 13, 2012 10:41 pm

alien wrote: Once you remove sprocket and carrier as discribed above. You just lift the cush drive rubber out and replace with new ones. They just sit in the hub, not fixed in anyway.
I am sorry, but you are wrong!
KTM street bikes have different types of rubber cushings...
On the picture theyare marked with the number 8.

Image

I changed one of them two weeks ago.
I spent 2 hours to figure out how to do it... then it was a 5 minutes job.

In short...
First I ripped out the inner metal bushing with the blind puller, then with a hammer and a flat screwdriver, I bent the outer bushing inside, to make a lip, this is easy as the metal is quite soft.
Then I turned around the wheel, leaned the screwdriver on this lip and with two punches it came out very easily.

When you are mounting the new cush, seat the center of the wheel on a piece of solid wood.
As I do not have the press, I used a wrench socket size 32, which is the same size as the outer bushing of the cush and then I punched it in place.

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alien
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Re: How do you change the Cush?

Post by alien » Fri Sep 14, 2012 9:22 am

Oh
My mistake, assumed ktm cush drives rubbers were the same as everyone else :?
Oh well you learn something new everyday :D
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Re: How do you change the Cush?

Post by Magic Wand » Sat May 14, 2016 3:37 pm

Anyone else removed and changed the cush rubbers/damping rubbers? How did you do it?
I´m trying to find out the best way to get them out without destroy them.

Will create my own rubbers to get rid of the annoying "free play" between the metal inside of the rubber and the bolt for sprocket support.

/M

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Re: How do you change the Cush?

Post by Magic Wand » Tue Jul 12, 2016 7:24 pm

Hi all

Just want to let you know that I made a tool to pull out the damping rubbers (not to destroy them) and it works great ;-)
I also found some good material to manufacture new damping "rubbers" and mounted them, and I find it to work very good!

/M
Last edited by Magic Wand on Sat Jul 30, 2016 6:16 pm, edited 1 time in total.

Nordic09
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Re: How do you change the Cush?

Post by Nordic09 » Thu Jul 28, 2016 6:26 pm

Just did it. I drilled a hole through the rubber, as big as possibe. Then with metal grinder drill and flat screwdriver made a cut outer and inner metal part (from the drilled hole). Then with long screw driver and hammer tapped pieces from other side. No need to break those otherwise, just one hole and then break metal and it collapses just sufficiently. Very good tip in this forum!

And it did help, but sprocket support bolts were singularly quite loose. If your cush is not very loose yet, I would start first and change those bolts to sprocket carrier, since that is much easier and maybe sufficient improvement. I might also change those on winter.
KTM SMT 2010 (Rottweiler and map in, secondaries, SAS and O2 off)
ex Triumph Street Triple R 2013 (too little torque)
ex Triumph Street Triple R 2011 (stolen)
ex Honda CR125 1989
ex Suzuki RG125 1985
ex Yamaha YZ80 1987

Magic Wand
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Re: How do you change the Cush?

Post by Magic Wand » Sat Jul 30, 2016 6:23 pm

Hyvvä!

Good that you found a way to demount the cush rubbers! Although I see the risk to make damage to the surface of the rim where the cush rubbers are seated...

You are right, first replace the sprocket carrier bolts to see if there is any improvement. If still not acceptable, replace the cush rubbers.

On my bike the bolts and cush dampers/rubbers where "quite loose" (in my subjective way to see it). Aprox. 0,25 mm play, and I don´t like it. That´s why I made my own rubbers ;)

/M

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Re: How do you change the Cush?

Post by Nordic09 » Fri Aug 12, 2016 4:14 pm

Changed bolts as well. It was surprising that even new bolt and cush has singularly quite loose fit. But when all 5 bolts are in, the sprocket is tight, and so is ride.
KTM SMT 2010 (Rottweiler and map in, secondaries, SAS and O2 off)
ex Triumph Street Triple R 2013 (too little torque)
ex Triumph Street Triple R 2011 (stolen)
ex Honda CR125 1989
ex Suzuki RG125 1985
ex Yamaha YZ80 1987

Magic Wand
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Re: How do you change the Cush?

Post by Magic Wand » Mon Aug 15, 2016 8:30 pm

Nordic09 wrote:Changed bolts as well. It was surprising that even new bolt and cush has singularly quite loose fit. But when all 5 bolts are in, the sprocket is tight, and so is ride.
Yes, very loose fit! But only for some miles, then everything will feel loose again... :-/
No other bike that I know about has this loose fit for the cush.
/M

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Re: How do you change the Cush?

Post by Magic Wand » Wed May 03, 2017 5:25 pm

Update!

During the winter I decided to let someone with material and knowledge manufacture softer cush for my 2 rear wheels. They came out to be absoluteely perfect ;-)

I told before I have made a tool to take out the cush units and I had a question to put up a picture of it.

So here it is:
Cush tool A.jpg
Cush tool B.jpg
Cush tool C.jpg
You whould know that it took me about... well, several hours to create this tool! I´m Not saying it´s 100% perfect. But with patience you will manage to take the cush out, without damaging nor the cush neither the rim/wheel.

/M

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Re: How do you change the Cush?

Post by Nordic09 » Thu May 04, 2017 8:39 pm

Great! Definitely better than drilling. I got a packet yesterday from China with multiple piece bearing puller, that is going to be used for sprocket carrier bearing. I bet it would had worked for the cush, too. It is good for the 8-35mm inner holes and for all KTM smt owners-from ebay, 65e. Same price than work only at the KTM dealer..
KTM SMT 2010 (Rottweiler and map in, secondaries, SAS and O2 off)
ex Triumph Street Triple R 2013 (too little torque)
ex Triumph Street Triple R 2011 (stolen)
ex Honda CR125 1989
ex Suzuki RG125 1985
ex Yamaha YZ80 1987

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Re: How do you change the Cush?

Post by Magic Wand » Sat May 06, 2017 2:38 pm

Way better.
But it takes time and patience to manufacture the tool... It´s definitly not made "in an hour or so"!

I doubt a bearing puller could do the job to get the cushes out, because the puller tool just grips the inside of the hole in the cush, and when you start to "hammer" it out it will bounce due to the fact that the rubber is elastic.

Yet I havn´t heard of anyone that used a puller to get the cushes out.

/M

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Re: How do you change the Cush?

Post by Nordic09 » Sat May 06, 2017 9:36 pm

That is well possible that it wouldn't work due to elastic cush as you said.
KTM SMT 2010 (Rottweiler and map in, secondaries, SAS and O2 off)
ex Triumph Street Triple R 2013 (too little torque)
ex Triumph Street Triple R 2011 (stolen)
ex Honda CR125 1989
ex Suzuki RG125 1985
ex Yamaha YZ80 1987

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Re: How do you change the Cush?

Post by limeyduffa » Mon May 08, 2017 10:42 am

A numpty question here: Why does the main drive need dampening ? To protect the engine/chain ?, or improve rider experience ? :geek:

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