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SB4 restoration
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Frank.61



Joined: 28 Nov 2013
Posts: 108
Location: Maasmechelen, Belgium

PostPosted: Sun Feb 09, 2014 8:55 pm    Post subject: SB4 restoration Reply with quote

Hi,

My name is Frank, Dutch from birth and living in Belgium.
Last November I was reading this forum and I saw Waggy's topic on the restoration of his HB2.
I was impressed to say the least with the standard of his work and it really inspired me hugely to look for a Bimota of my own.
I've always been a huge fan of the KB2 from day one (1981).

Well KB2's are as rare as they come (or very expensive) so having seen the HB2 I regarded them (the whole HB2/3, KB3 & SB4/5 generation) as big brothers of the KB2 and although no concentric swingarm, they have a more inspiring swingarm to compensate for that.

In December, after a 3 week search and an attempt to buy one from Berlin, I bought my SB4 which had less than 5.000 miles in Holland from a classic car trader.
Perfect for what I wanted: a low mileage SB4 ideal for a restoration project.
And although it looks nice on the pictures shown, there were a lot of small signs that this bike needed a full overhaul.

In my next contribution I will tell you how I want to restore it and what the shortcommings are of this SB4 (frame 536190).

I did have some problems with uploading my pictures in Photobucket but here are the pictures before I took here appart.

Well, it's a start Embarassed






Ciao, Embarassed
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Vince186



Joined: 23 Mar 2012
Posts: 636
Location: Nijmegen (Netherlands)

PostPosted: Sun Feb 09, 2014 9:28 pm    Post subject: Reply with quote

Nice Smile
Canít wait to see more pictures about the restoration.
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vince
A person who never made a mistake never tried anything new. Albert Einstein
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stockcar



Joined: 07 Apr 2011
Posts: 728
Location: in the shadow of the "angel"

PostPosted: Sun Feb 09, 2014 9:32 pm    Post subject: Reply with quote

lovely, and a neat set of EZ clocks to boot.......
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Frank.61



Joined: 28 Nov 2013
Posts: 108
Location: Maasmechelen, Belgium

PostPosted: Sun Feb 09, 2014 9:34 pm    Post subject: Reply with quote

Hi,

Well since the SB4 started but ran VERY bad I decided not to ride it (or her?) and dismantle it immediately.

Started with the carbs and although not very filthy all jets were covered with a kind of lacquer like substance.
For me a sign the SB4 was not used a lot.

Well I cleaned them around christmas time, removed the black paint sanded the text from the lids an partially repainted them.

Here some pics




Before





After cleaning/stripping them. Very Happy





Outside of the exterior carburators I've repainted black, as per original.
Rest not since it's easier to keep them clean and see if they leak.
Pic of the black painted carb is not that well in reality it looks the part.
I used VHT paint (should be fuel resistant).

The membranes/diaphragms were o.k. but I 've ordered new ones (replicas) in the USA should I need hem in the future (from JBMindustries).
Since I will mount K&N's, I have ordered a Dynojet stage 1&3 set as also all o-rings (some in Viton) which I will use once I assemble them.
But for sure I will use proper screws instead of the butter quality steel ones used by Mikuni.

Untill next post!

Feel free to respond anyway you like! Shocked

Frank
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Macx2



Joined: 03 Dec 2011
Posts: 44
Location: Wide Bay Queensland Australia

PostPosted: Sun Feb 09, 2014 10:44 pm    Post subject: Reply with quote

It looks like a good bike to restore, Frank. I am 80% through an SB2 and these early Bimotas are very interesting to deal with. Good luck and enjoy!
Ian


Last edited by Macx2 on Sun Feb 09, 2014 11:30 pm; edited 1 time in total
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CNC



Joined: 19 Jul 2013
Posts: 249
Location: Slovenia

PostPosted: Sun Feb 09, 2014 11:18 pm    Post subject: Reply with quote

This looks like very detailed and professional approach... It is pleasure to watch this pictures. Do cary on!!!
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Bimota DB7, Bimota DB5 Mille, Ducati 916, Ducati M900
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waggy



Joined: 26 Sep 2011
Posts: 273
Location: Northern Ireland

PostPosted: Mon Feb 10, 2014 6:46 am    Post subject: Reply with quote

shes looking great frank, keep up the good work.
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2bims



Joined: 03 Apr 2010
Posts: 5470

PostPosted: Mon Feb 10, 2014 10:34 am    Post subject: Reply with quote

Very nice Frank....a detailed work of painstaking restoration with great piccies...keep up the good work...it will make a nice record on here of your efforts.. Laughing
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Evilchicken0



Joined: 12 May 2010
Posts: 2821
Location: London

PostPosted: Mon Feb 10, 2014 2:28 pm    Post subject: Reply with quote

Looks good Very Happy
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brian



Joined: 22 Aug 2011
Posts: 2699
Location: QLD, Australia

PostPosted: Tue Feb 11, 2014 12:05 am    Post subject: Reply with quote

This will be another great resto thread to watch! Nice photo's frank. The dash has more guages and idiot lights than my car!


Keep up the good work
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Current motorcycles - '99 Bimota DB4, '96 Bimota SB6, '08 VTX1800, '93 ZXR750R M1, '95 ZXR750, '95 ZXR750 Race Bike, Ď94 CBR400rr NC29 Race Bike, '94 CB250, '49 BSA C10 250, Ď61 BSA A10 650
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Frank.61



Joined: 28 Nov 2013
Posts: 108
Location: Maasmechelen, Belgium

PostPosted: Mon Feb 17, 2014 3:08 pm    Post subject: Reply with quote

Hi,

Has anyone an idea what material is used for the frame and swing arm of the SB4 (basically any 1980-1985 Bimota)?

I know it is a chromium-molybdenum steel but do not know the precise alloy.
If/when it needs to be welded I would like to know what alloy it is.
Want to know the impact if, for example, a small bracket would be attached to it (e.g. for the piggyback of the rear shock).
If so, I want to do it before powder coating the frame.
I have seen a drawing mentioning the thickness of the various tubes used in the frame but no material specifications.

Must be someone who knows?!

Anyone ...... ?

Frank
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waggy



Joined: 26 Sep 2011
Posts: 273
Location: Northern Ireland

PostPosted: Mon Feb 17, 2014 6:49 pm    Post subject: Reply with quote

Hi Frank,

Not sure of grade of frame. A simple solution that leaves the frame original and unmarked is what I went for. Not the smartest, but will be invisible when the bodywork is on.
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Frank.61



Joined: 28 Nov 2013
Posts: 108
Location: Maasmechelen, Belgium

PostPosted: Mon Feb 17, 2014 8:38 pm    Post subject: Reply with quote

Hi Waggy,

I'm drawing up a clamp but consider also a small bracket should it not materialize.
Your exhaust clamp looks nice (muffler looks impressive, one off?).

Frank
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waggy



Joined: 26 Sep 2011
Posts: 273
Location: Northern Ireland

PostPosted: Mon Feb 17, 2014 9:16 pm    Post subject: Reply with quote

Hi Frank,

I was lucky that previous owner had a bespoke exhaust and clamp made for it. one less job to do Smile
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SiBag



Joined: 03 Mar 2012
Posts: 250
Location: Cheshire

PostPosted: Fri Feb 21, 2014 3:54 pm    Post subject: Reply with quote

I would expect the tubing would be similar to the Harris frames of the same age. All of the Harris frames are Bronz Welded.
As far as the Shock res goes what you need is something like these.

http://s1319.photobucket.com/user/SiBag/media/ResMount-1_zpsf0dbcf7a.jpg.html?sort=3&o=0
http://s1319.photobucket.com/user/SiBag/media/ResMount-2_zps9564d510.jpg.html?sort=3&o=1

I knocked them up on my little mill for my Harris.

Si..[/img]
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Si...
SB6..CCM R30...GSXR-750-M...RGV-250-VJ22.. GSX-1100-EFE Project....Harris Magnum II project...

If its got Ti#s or Wheels its gona give you trouble
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