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YB11 Fork Seals - just might have cracked it!
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zombie



Joined: 10 Feb 2009
Posts: 272
Location: UK

PostPosted: Thu Jun 17, 2010 11:38 pm    Post subject: YB11 Fork Seals - just might have cracked it! Reply with quote

Failed MOT as always with leaking seals. This year no one could get fork seals for me YB11, not riders, Woods or NLM. Bimota Italy claimed they did not do them anymore, (well who wants to wait anyway).

Found a solution - at least 2 get me through the MOT. Check this out.
51mm inner = nearly 2 inches (50.8mm). 63mm outer is nearly 2.5 inches.

Are you with me yet?

Yep - bizarre as it might sound an imperial fork seal should just about (tight fit outer diameter and inner) fit a YB11.

So if you get a 2x2.5x0.25 imperial seal (standard size) it will fit.

These guys www.simplybearings.co.uk do that size fork seal.

Anyway the YB has passed the MOT. Lets see how long it lasts. If it lasts longer than the YB11 standard seal (about 5k miles) we are getting somewhere.

Did Paoili purposely chose this imperial seal ??? If so why not tell the world about it instead of quoting bizarre metric dimensions?

Zombie
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Fri Jun 18, 2010 9:05 am    Post subject: Reply with quote

Think you might be onto somthing there Wink
They are a very wierd metric size.
Could this be an old problem solved ?
We await your long term test results
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philfingers



Joined: 05 Sep 2009
Posts: 337
Location: Bimota Capital of the UK, Kidderminster

PostPosted: Tue Jun 22, 2010 1:09 pm    Post subject: Reply with quote

I was thinking the same thing a few days ago. I have a bilstein strut body with a weird thread which is as far as I can tell M51 x 1.0. Now Bilstein is German but i was thinking along the lines of it's very close to 2.0". Similarly so is the YB11 seal. . . . .
Let's see how long it lasts, my bike has done 3k from new and they weep very slightly
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03 YB11, 03 Aprilia RSVR Edwards, 94 Ducati Superlight III, 95 Honda NC30, 04 Ducati 999S, 91 kawasaki KR1-S C2, 91 Ducati 851 USD Strada, 89 ZXR750H1, 90 ZXR400H1, 205 16v Rally Car, A6 2.7TDI Avant, STM R1 engined Phoenix
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zombie



Joined: 10 Feb 2009
Posts: 272
Location: UK

PostPosted: Wed Jun 23, 2010 9:21 pm    Post subject: Reply with quote

i'll let you know, so far so good after 60 miles Smile
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fish



Joined: 15 Mar 2010
Posts: 138
Location: australia

PostPosted: Sat Aug 28, 2010 2:22 pm    Post subject: yb11 seals Reply with quote

hi shearwater motorcycles in tasmania aust have put a set in my yb11 believe they got them from a local seal shop ,havent tested them yet as not home at moment.
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DB1-DB2SR-DB2EF-DB3-DB4 Db10 YB6-yb7_yb10-2xyb11-SB5,2xSB6-kb3-yb5-MILLE MIKEHAILWOOD HARRIS MAGMAN2-TRIUMPH T140-RG500x2-KAWA Z900-SUZUKI GSX1100-DUCATI 900SS- 750 sport ducati DUCATI F1 750- 851 tri colour-500sl-1996 Trumph datona . Vee two alchemy
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Tue Oct 19, 2010 12:06 pm    Post subject: Reply with quote

Anybody got a manual for the 51 mm forks ?
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philfingers



Joined: 05 Sep 2009
Posts: 337
Location: Bimota Capital of the UK, Kidderminster

PostPosted: Tue Oct 19, 2010 12:51 pm    Post subject: Reply with quote

I'm sure i had a PDF of it but can't find it. If I do I'll let you know. I did a search but can't find it on the web anywhere either Sad
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03 YB11, 03 Aprilia RSVR Edwards, 94 Ducati Superlight III, 95 Honda NC30, 04 Ducati 999S, 91 kawasaki KR1-S C2, 91 Ducati 851 USD Strada, 89 ZXR750H1, 90 ZXR400H1, 205 16v Rally Car, A6 2.7TDI Avant, STM R1 engined Phoenix
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Wed Nov 03, 2010 1:03 pm    Post subject: Reply with quote

Well , after messing around stripping forks , oil everywhere , discovered all you need to do , is leave the fork in one piece , release seal spring clip , and then gently tap gold seal carrier downwards. As forks are all seperate parts the carrier slides over the carbon sheath , and the seals just pop out. Can change seals in about 5 minutes flat. Another point is simply bearings have either sold out of the fork seal pairs , or got wise , only imperial seals of correct size I could find on there site were £12 each.
First seal I fitted was very tight and ended up leaking , found I had to make the outer diameter smaller so as no to crush the inner diameter to much. Only done a quick 10 miles so far , but all seems ok at present.
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philfingers



Joined: 05 Sep 2009
Posts: 337
Location: Bimota Capital of the UK, Kidderminster

PostPosted: Wed Nov 03, 2010 1:41 pm    Post subject: Reply with quote

how did you make the outer diameter smaller out of interest?
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03 YB11, 03 Aprilia RSVR Edwards, 94 Ducati Superlight III, 95 Honda NC30, 04 Ducati 999S, 91 kawasaki KR1-S C2, 91 Ducati 851 USD Strada, 89 ZXR750H1, 90 ZXR400H1, 205 16v Rally Car, A6 2.7TDI Avant, STM R1 engined Phoenix
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vort28



Joined: 22 Mar 2010
Posts: 2194
Location: Northwest , UK

PostPosted: Wed Nov 03, 2010 2:23 pm    Post subject: Reply with quote

Had a few large nylon washers , clamped seal between 2 , mounted in drill , and a few minutes later with some emery cloth , outer diameter down to 63.1mm . Seals I got were the redy brown viton ones. Forks had previously been re-sealed by a suspension company the previous owner had sent them to , think he had used an angle grinder to do a similar job , no wonder the seals failed after about 100yrds.
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oily



Joined: 05 Apr 2008
Posts: 4788
Location: worcestershire

PostPosted: Thu Nov 18, 2010 6:35 pm    Post subject: Re: YB11 Fork Seals - just might have cracked it! Reply with quote

zombie wrote:

Did Paoili purposely chose this imperial seal ??? If so why not tell the world about it instead of quoting bizarre metric dimensions?
Zombie


Allegedly not, I've just read that Paoili commissioned KYB to make a batch of 51mm seals specifically for this 51mm fork leg Crying or Very sad
KYB are not making any more so if the factory ain't got any more.................good luck guys Wink
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Tue Jan 04, 2011 10:12 pm    Post subject: Reply with quote

I've found a source of YB11 fork seals Very Happy Very Happy Very Happy

£33 a pair PM and I'll pass the details on
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Evilchicken0



Joined: 12 May 2010
Posts: 2996
Location: London

PostPosted: Thu Jan 13, 2011 12:45 pm    Post subject: Reply with quote

Provisonally all sold
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GregB



Joined: 26 Aug 2013
Posts: 8
Location: New Zealand

PostPosted: Tue Sep 03, 2013 1:38 am    Post subject: Reply with quote

Courtesy of BimotaNige and a few others.
I have just bought a YB11 and it came with printouts for the RSU51's A parts catalogue for the entire bike and part of the manual. I have since ontained the balance of the manual and put all on Google docs to share.
The folders hold individual JPG files for each page and the Main combined PDF's are in the opening folder.
Hope this helps all.
https://drive.google.com/folderview?id=0B9xaBPuWLqBuZmx4UDlNWjNiQWc&usp=sharing

If the link does not work PM me and I will email it back directly.
No login should be needed.

Cheers

G.
Happy new YB11 owner New Zealand
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08 Katana
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philfingers



Joined: 05 Sep 2009
Posts: 337
Location: Bimota Capital of the UK, Kidderminster

PostPosted: Tue Sep 03, 2013 8:34 am    Post subject: Reply with quote

thanks Greg, had a quick look all looks good
this http://www.carlsalter.com/motorcycle-manuals.asp is pretty good too for manuals, tho no Bimota ones
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03 YB11, 03 Aprilia RSVR Edwards, 94 Ducati Superlight III, 95 Honda NC30, 04 Ducati 999S, 91 kawasaki KR1-S C2, 91 Ducati 851 USD Strada, 89 ZXR750H1, 90 ZXR400H1, 205 16v Rally Car, A6 2.7TDI Avant, STM R1 engined Phoenix
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