Counter Sprocket Retainer - Page 2 - - The Ultimate Ducati Forum
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post #11 of 37 (permalink) Old Jan 28th, 2009, 12:39 pm Thread Starter
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I just did some searching and Richard (from Richard's ST2 Pages) has this page dedicated to the issue and the recall from '98....

From what he wrote, there is a concern that the worn retainer can allow the sprocket to actually come off the shaft, altogether. He also mentions about the sprocket walking in and doing damage to the case. Ducati singled out the 1998 ST2s VIN WB002137 to VIN WB003736, maybe there is something other than the retainer different with those VIN #'s compared to other bikes, but he does state that the concern is not limited to just the '98 ST2, though.

Originally Posted by jack View Post
Maybe they're not hardening the clips like they did in the past or do you think the chain may have jumped the groove on the swing arm guard and pulled the sprocket to one side?
I think the ST2's front sprocket has an offset, so you cannot turn it around, but I don't remember correctly. I do remember that the '01 M900ie has a weird offset on both sides of the sprocket, though. If I still had access to a Rockwell tester, I could test the hardness of the retainer with a new one, but I no longer work where I have access to one. I didn't think about it, but catching the slider just right could have pulled the sprocket over. I recall Saturday, hitting a local road with some dips in it hard enough to have bottomed and hit the header that goes under the engine, so something like that could be possible.......

BTW, it's a fun and fast road nick-named the "Roller Coaster". Here's a small picture of a guy I know jumping his CBR954RR from one of the hill crests...

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post #12 of 37 (permalink) Old Jan 29th, 2009, 6:16 am
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There was a TSB/Recall on Early ST's. I am not sure what year your is but call a dealer and have them check the VIN. The splines to me look ok so get a new updated retainer and put it back together. If you are going to replace anything I would suspect the chain would have some wear from side flexing and you may want to do chain and sprockets.
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post #13 of 37 (permalink) Old Jan 29th, 2009, 10:08 am
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This same problem happened to me two years ago on my ST4. I went to the ST Madness gathering in Utah from Calif. When I got back home, I was coming home from work and left a stop sign and lost my drive chain. The sprocket was moving back and forth on the splines and the chain rubbed against the clutch slave wearing off the nubs on the links. The ones holding the masterlink stick out just a tiny bit more and those wore off. The masterlink keeper then went bye bye, then the chain came off the bike. I was lucky as I was hardly moving when it just unraveled and lay on the street.

The scary part of this story is that I was doing 140 mph through Nevada on the way home from Madness. If the chain would have let go at those speeds, who knows what would have happened.

I now change out the sprocket retainer every time I change out the chain.

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post #14 of 37 (permalink) Old Jan 29th, 2009, 10:30 pm
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Originally Posted by arai_speed View Post
I hear that. My old R1 got washed a few times in the 7 years I owned her. The Monster get's cleaned quite often - every other ride or so. I can't help it

Hot damn! With wheels that white, I can imagine! Very nice!
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post #15 of 37 (permalink) Old Feb 18th, 2009, 7:00 pm Thread Starter
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Alternate Retainer Design

Well, about 1000 miles later, and I finally got some parts made to redo the way the sprocket is retained on the shaft. I am now using an original retainer, two custom made spacers to get the correct thickness, a custom end plate, two longer retainer bolts, and another bolt to go into the end of the output shaft. I'm going to run it like this for a little while and maybe safety wire the three bolts, later. There is absolutely no wiggle, wobble, or free play on the counter-shaft sprocket, now.

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post #16 of 37 (permalink) Old Feb 19th, 2009, 10:40 am
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That's a great looking fix!!

What really sucks... when this happens on the ST models with wet clutches, because there's an oil galley plug just behind the countershaft sprocket, so if the clip allows the sprocket to move back... it grinds the head of the oil galley plug off... ejecting all the oil, all over the back tire... which sucks when you're on a twisty road. (Don't ask me how I know this.)

The dealer designed a fix with an old countershaft sprocket, fitted behind the actual countershaft sprocket, which doesn't allow it to move back, even if the retaining clip should fail.

At minimum, be sure you're keeping those retainer clips fresh... but I like the design above MUCH BETTER!!

Fresh out of Ducatis in the garage at this moment.

Hang on... what's this? I must have that!

Welcome to the garage, Mr. GT1000!
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post #17 of 37 (permalink) Old Feb 19th, 2009, 11:13 am Thread Starter
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Originally Posted by LiquidSilver View Post
That's a great looking fix!!

My buddy has the spacers programmed into his CNC plasma cutter, so he can cut them out of any thickness of sheeting up to 1/4" with his current cutting tip. Using the plasma cutter required some cleaning of the edges and we made the holes a little under-sized, so those needed to be opened and cleaned a little bit, also.

I'm thinking of putting this system on a couple other bikes, but the thickness of the spacers is dependent on the model of bike. When using the OEM retainer, I needed around 0.185" worth of spacers before adding the end retainer for my '98 ST2. I have no idea what my 748 or the Monster would require.

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post #18 of 37 (permalink) Old Feb 21st, 2009, 1:59 am
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[QUOTE=Desmo_Demon;561847] There is absolutely no wiggle, wobble, or free play on the counter-shaft sprocket, now.

Not really sure if it’s going to matter, but I’d be a little concerned that the sprocket won’t be allowed to “Float” as I believe it was designed to do, which may cause or create some unwanted stresses in the area. Possibly even picking up some added vibration that may transfer into other parts of the trans, bearings, seals, etc?

Just a thought……..

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Last edited by yellow blur; Feb 21st, 2009 at 9:50 pm.
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post #19 of 37 (permalink) Old Feb 21st, 2009, 10:09 am
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I checked my retainer while doing the rebuild and found it worn too. I just replaced with a new one. I did catch it before the sprocket got off the mark
and did any damage. I'd think that for 7 bucks I'll just keep a spare and
check it every so often.

But, your retainer design looks great and let me know if it doesn't create any other problems.

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post #20 of 37 (permalink) Old Feb 21st, 2009, 3:01 pm
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Terry, I'd always be interested in a set for my '98 ST2 if you make more.


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