Rear sprocket replacement

pcv57 · February 20, 2011, 12:16:47 PM

I'm replacing the stock rear sprocket with a Drive Systems steel unit. When I pulled the cush drives out of the stock sprocket, they slipped right out. Now I'm trying to insert them into the new sprocket and they won't go. I've cleaned the edges of the cush drives, greased both sections, and even with a mallet I can't get them down into the holes of the new spprocket. Any suggestions?

stopintime · February 20, 2011, 12:29:25 PM

How sure are you that you've got the right sprocket?

Part # ?

pcv57 · February 20, 2011, 12:46:15 PM

I don't have the part # in front of me but it says it's for SSS Ducati's. Plus I ordered it from Jeff at Monsterparts over the phone and he's always been great.

pcv57 · February 20, 2011, 12:49:14 PM

I was just thinking about this and wondered if temperature might play a part. I had the sprocket out in the shed where it's been pretty cold. Is it possible the steel from the sprocket contracted? If so, do you think it would help to heat it up a little and try again? Right now it is extremely tight.

stopintime · February 20, 2011, 01:20:16 PM

It's not likely that Jeff mixed it up, but his supplier might have. Again, not very likely, but I'd check your part # against.. http://www.drivesystemsusa.com/c/119131/1/1000-s2r-monster-06-08.html

Heat plays a role, yes. Try heating the sprocket with a hair dryer and cool down the cush drives in the fridge.

ducpainter · February 20, 2011, 01:25:28 PM

Are the cush drives the same on all Duc SSS's?

stopintime · February 20, 2011, 01:32:28 PM

Quote from: ducpainter on February 20, 2011, 01:25:28 PM
Are the cush drives the same on all Duc SSS's?

At least the S2R and the S4RS. Don't know about SBK.

ducpainter · February 20, 2011, 01:35:36 PM

Quote from: stopintime on February 20, 2011, 01:32:28 PM
At least the S2R and the S4RS. Don't know about SBK.

I checked and the part# is very close to early SBK. Just the letter at the end is different which could mean they are the same.

Sometimes pieces just being at room temp can make the difference, or it could be a badly machined part.

A call to Jeff will straighten things out I'm certain.

Speeddog · February 20, 2011, 04:21:42 PM

Try loosening the cush drives / nuts, pushing the sprocket on, then retightening the cush drives.

pcv57 · February 20, 2011, 06:34:39 PM

Thanks all! I did heat up the sprocket with no luck. The cush drives have been taken off the carrier and they still don't go in and I don't want to force them so I'll wait to talk with Jeff. It's 20 degrees out and I have 3ft of snow on the ground so it's not like I'm riding anytime soon

Howie · February 20, 2011, 06:38:26 PM

Is the carrier an OEM (stock) part?

pcv57 · February 21, 2011, 04:45:12 AM

Yes, the carrier is stock but the sprocket is aftermarket. I have taken the cush drives off the carrier, heated the sprocket, put the cush drives in the freezer, tried installing them from every angle and no luck. They just slip in and out of the old OEM sprocket.

ducpainter · February 21, 2011, 04:48:19 AM

Quote from: pcv57 on February 21, 2011, 04:45:12 AM
Yes, the carrier is stock but the sprocket is aftermarket. I have taken the cush drives off the carrier, heated the sprocket, put the cush drives in the freezer, tried installing them from every angle and no luck. They just slip in and out of the old OEM sprocket.

Call Jeff.

pcv57 · February 23, 2011, 02:12:49 PM

I called Drive Systems, the manufacturer and they told me the fit shouldn't be so tight. It's probably a manufacturing defect. They were great on the phone and sent out a replacement and upgraded the unit at no cost for the inconvenience. At least I'm not going crazy, yet

atomic410 · March 01, 2011, 06:41:33 AM

its not that uncommon for the sprockets to be just off a hair and causing a ton of inconvience. i ordered 5 vortex sprockets now and 2x the inner diamater of the sprocket was just off so it had to be dremmeled. if its 20degrees out why'd you put it in the freezer? you are in the freezer

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Rear sprocket replacement