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Rear Wheel Cush Rubbers

2194 Views 5 Replies 6 Participants Last post by  Muschi
Has anyone had to replace the six cush rubbers in the rear wheel on their GT1000? I am at about 10,000 miles and the bike has started to run "snatchy" unless I am accelerating or really keeping the revs up. The chain and sprockets are fine. If I put the bike up on a stand, hold the rear sprocket and rock the wheel back and forth there is about 1/32nd play between the sprocket carrier and the wheel. Is this within normal limits or are the cush rubbers/bushes shot? Any opinions? How straight forward is replacement? Thanks for your input.
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I replaced a set when I rebuilt the set of sport wheels I have on my GT because I wanted to powdercoat the hubs. It's a total pain in the ass. Let me refraise that, TOTAL PAIN IN THE ASS. :D

There is no way to access them from behind, so short of trying to cut out the rubber with a hole saw and then grinding through each sleeve with a dremel tool, then prying them out, what I did was find a metal rod that just fit in the center sleeve. Then I packed the cush drive/hub full of grease, put the rod in and pounded them out with a sledge hammer. Repacking more grease as neccesary. I had to heat the hub on most of them, but usually they would start to slowly moveo out with the first couple hits, about 1/32" at a time. Hit, hit, pack, hit hit, pack.....took forever, but they all came out clean.

That said....my stock GT cush drives had a buch of play in them right from the start, with probably only about 2000 miles on them. Before I changed wheels what I woudl do is cut little square pieces of aluminum from a beer can and curve them to fit on the non drive side of the sprocket carrier pegs to take up the slack. Worked great.

I'm not sure how many miles, wheelies, drag races, etc. it would take to actually wear out the cush drives, but I saw no wear on them in either set of wheels (over 38,000 miles on my bike now). They just fit loose. Also, the sprocket carrier pegs get worn, so maybe check that.
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This never gets old

I doubt the rubber ever wears, but the steel pins and sleeves will, especially if there is any play. Like Dietrich, my GT had play from the word go and I think that it stems from the exact locations of the pins, relative to the rubber sleeves. If you measure the pins and the ID of the bushes, there is quite a lot of clearance, so I believe that the tightness in the assembly results from each pin being slightly misaligned with each bush, so that when assembled, the bushes are forced over slightly and so tension is created. I know that with my other Ducati, I have to force the pins into the rubbers because they don't line up, wheareas on my GT, I think that the pins and bushes were too well aligned, resulting in play.

One answer to this may be to strike each pin with a copper mallet to move them over a tad, but I don't want to be the guinea pig that tries it! Instead I used some steel shimming, around 5 thou thick and made sleeves to go around each pin. Either way, you need to do something or the wear will rapidly accellerate.
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Cush Drives

having been through the experience of removing cush drives (CD) on 2 sets of wheels allow me to offer the following advice...

USe a blind bearing puller (basically a bipod) with an expanding bolt in the middle of it. Insert bolt into the CD and expand it so ip grips on it. place both legs of tew bipod onto the hub and use a spanner to 'unscrew' the bolt. This basically pushes the bipod onto the hub and the opposing force pulls the CD out. Took me about 20 mins to remove all of them, easy as pie.

Having gone through the bashing, drilling, cutting and even blowtorch method I can vouch for this one!

Hope that helps! Putting new ones in also interesting. If you have access to a hydraulic press definitely use that method. You do not want to knock those suckers in at an angle!
USe a blind bearing puller ... easy as pie.
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