Bimota Forum Forum Index Bimota Forum
Forum for Bimota Owners and Riders
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in  

Bimota DB1 - Rear MArzocchi Shock

 
Post new topic   Reply to topic    Bimota Forum Forum Index -> DB Series
View previous topic :: View next topic  
Author Message
2bims



Joined: 03 Apr 2010
Posts: 4522

PostPosted: Sun Feb 05, 2017 9:41 pm    Post subject: Bimota DB1 - Rear MArzocchi Shock Reply with quote

Hi Guys....Bit of a longshot....but with such a knowledgeable lot out there...maybe someone can help......Marzocchi rear single shock absorber....NOS....but from 1986...I need a new rear bump stop....item has a cabled knurled knob adjuster, with 3-position setting, evidently spring pre-load ring also.....item is gassed with a schraeder threaded adjuster to connect a pump to....Any idea what pressure it should be at...be it in bar or PSI...I have a Scott bicycle rear shock pump that is 0 - 40 bar adjustable, which is 0 - 600PSI...but have no idea what the pressure should be on a stock shock...BIke is a BImota DB1, 1986 vintage, and this was the standard rear shock they fitted...It seems that the BMW K100 of similar vintage also used a Marzocchi rear single shock if that helps, but unaware of what model the shock is they used....
HEres also a link on ebay to a NOS Marzocchi rear shock repair kit for a BMW K100 but as I've said..I've no idea if this is the same shock as the one I've got.... http://www.ebay.co.uk/itm/Marzocchi-Shock-Rebuild-kit-for-BMW-K100-part-number-850115-/232029048878?hash=item360602502e:g:w~AAAOxyu1FRkjH0
Back to top
View user's profile Send private message
quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Feb 08, 2017 6:19 pm    Post subject: Reply with quote

No idea but not too expensive of a gamble and the o-rings appear to be Viton. Do you have any suspension companies (like Race Tech here in So Cal) that can restore your shock?

Re: pressure, I would think that they are all nitrogen filled but unsure of how much pressure is standard.
Back to top
View user's profile Send private message Send e-mail
quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Feb 08, 2017 6:22 pm    Post subject: Reply with quote

Oh. DON'T use "air". Maybe it has to do with the moisture content in regular "ambient" air versus the drier nitrogen gas. nitrogen refilling "should" require the use of a HP regulator but I am certainly not well versed in this arena.

I think the typ. pressures are 100-150psi but I wouldn't do it myself. Rebuilding is one thing but I'd have a suspension shop refill it.

Still looking for more info for you though...
Back to top
View user's profile Send private message Send e-mail
quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Feb 08, 2017 6:28 pm    Post subject: Reply with quote

I found these guys.

http://www.brooksuspension.co.uk/

http://www.mhracing.com/ser_rebuild-service.php

http://ftrsuspension.co.uk/
Back to top
View user's profile Send private message Send e-mail
quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Feb 08, 2017 6:32 pm    Post subject: Reply with quote

is it like these?

http://www.ebay.com/itm/DUCATI-907-IE-PASO-REAR-MARZOCCHI-SHOCK-/201808262394?hash=item2efcb5b4fa:g:qwEAAOSwHMJYE8ak&vxp=mtr

http://www.ebay.com/itm/Ducati-paso-750-Desmo-906-1987-Marzocchi-Rear-shock-absorber-with-linkage-NICE-/262701099611?hash=item3d2a34aa5b:g:PVIAAOSwcUBYGPDp&vxp=mtr
Back to top
View user's profile Send private message Send e-mail
quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Feb 08, 2017 6:39 pm    Post subject: Reply with quote

These guys (guy) have very good reports on their service and ability to make things work better than new. Granted it is in the States but they receive and send their work worldwide.

http://www.motocd.com/service/
Back to top
View user's profile Send private message Send e-mail
2bims



Joined: 03 Apr 2010
Posts: 4522

PostPosted: Wed Feb 08, 2017 6:40 pm    Post subject: Reply with quote

Cheers Duk...it kind of confirms what I have heard elsewhere...as I multipost on other forums to expand search criteria beyond us Bimota boys, a small bretheren that we are....Practicalsportbikes facebook being one such place.

The post is actually for another Forum member on here that is restoring a DB1....but personal issues means he's away so I said I would assist....Its actually a NOS item I bought from LoudBikeSteve in Canada when he had Db1 stock...but evidently 30 years old...and I sold it to the other nice fellow...along with some other spares on one of my big clearout sessions...then...when he pulled it out of storage the bumpstop magically disintegrated...I think he has big mice in his garage....So..felt guilty and liable to assist....others have said max 10 bar which is 150psi...and yeh...use nitrogen not air...Air is 78% Nitrogen...but 21% oxygen....Nitrogen has one of the lowest expansion rates under heat...Oxygen one of the highest...but all are compressible...and all expand...is about as much as I've gleaned
Back to top
View user's profile Send private message
quikduk



Joined: 13 Aug 2016
Posts: 156
Location: Southern California, USA

PostPosted: Wed Feb 08, 2017 6:42 pm    Post subject: Reply with quote

This place is down the street from my office.

http://www.roadracingworld.com/news/new-owner-new-address-for-lindemann-engineering/

http://www.le-suspension.com/

If you cant get help across the pond, contact them and let me know if I can help. I used them back when I used to race and their work was stellar.
Back to top
View user's profile Send private message Send e-mail
Quadrasuarass



Joined: 23 Aug 2013
Posts: 39

PostPosted: Wed Feb 08, 2017 8:53 pm    Post subject: Reply with quote

I pulled the old Marzocchi out of my DB1 and have replaced it with a Maxton unit. I have the old shock laying around the place somewhere. I'll try and dig it out tonight to see if the bump stop can be re-used, it's of no use to me any more. However I fear it will have perished and not be of use. I can post a pic when I find it so you can see what it looks like. Meanwhile this is what I have dug up from photo archive



Cheers
Nigel

Back to top
View user's profile Send private message
Mike Jennings



Joined: 22 Mar 2008
Posts: 282
Location: England

PostPosted: Sun Feb 26, 2017 4:23 pm    Post subject: Reply with quote

Hello,

if the rubber bump stop has disintegrated, how do you fit a new one? Would you have to disassemble the shock?

Cheers, MikeJ
Back to top
View user's profile Send private message
PaulDB2



Joined: 26 Apr 2014
Posts: 136
Location: Manchester

PostPosted: Sun Feb 26, 2017 5:01 pm    Post subject: Reply with quote

It looks like that is the only way. The bump stop itself is quite shallow. If one could find a flexible alternative it could be possible to cut it vertically then pass it around the 16mm piston rod and superglue it together./ I now have two shocks, my original alloy bodied one and a NOS steel bodied version, unfortunately the bump stop has disintegrated on both!
Resigned to have to get the shock rebuild.
_________________
Bimota DB1, Bimota YB6 Exup, Bimota YB9 SR, Ducati NCR Replica, 1997 Ducati 900SS, Honda CR750 project
Back to top
View user's profile Send private message
Mike Jennings



Joined: 22 Mar 2008
Posts: 282
Location: England

PostPosted: Sun Feb 26, 2017 5:37 pm    Post subject: Reply with quote

Hello,

you could try 'rubber bump stop' on ebay in the vehicles section. They seem to have quite a few but you'd have to check the size,

Cheers, MikeJ
Back to top
View user's profile Send private message
Bud977



Joined: 03 Mar 2013
Posts: 327
Location: Sydney

PostPosted: Sun Feb 26, 2017 8:20 pm    Post subject: Reply with quote

You have to remove the eye end of the shock to replace the bump stop rubber. Glueing a split rubber in place wouldn't last one speed hump.
Back to top
View user's profile Send private message
DB1 860



Joined: 23 Mar 2014
Posts: 20
Location: Sydney

PostPosted: Tue Feb 28, 2017 10:13 pm    Post subject: Reply with quote

So can these rear shocks be pulled apart and serviced ?
I've been thinking of getting mine done as its not been touched since new.
Back to top
View user's profile Send private message
Bud977



Joined: 03 Mar 2013
Posts: 327
Location: Sydney

PostPosted: Wed Mar 01, 2017 7:17 pm    Post subject: Reply with quote

It sure looks like it. You could try Frank Pons to rebuild the shock. He's old school and can fix anything. Let me know if you'd like his details.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Bimota Forum Forum Index -> DB Series All times are GMT + 1 Hour
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group

The Bimota Forum has no official connection to Bimota S.p.A.. We just ride or are interested in their motorcycles and support the brand. All trademarks are acknowledged