Early GS works bikes/Herbert Schek

Rupsol

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Hi chaps - new here so go easy. I am interested in building an early GS works replica(78/79) or a Herbert Schek replica for vintage enduro. I currently race National twinshock motocross (not very good at it mind and have a permanent limp;)) I have owned an 03 1150 in the past and loved it. Only bike I have ever ridden that actually fitted me as I am 6ft 9! So I am not a total beemer virgin.

I know very little about these early ISDT bikes. Have seen lots of pics on the web and read a bit as well but no idea what the specs were. Bike needs to be as lightweight as possible (Schek got his down to 130kg apparently) and I know they used certain cranks and cases to make the engine as slim as possible. I believe the cradles were fairly standard with brackets removed and strengthened in places and the subframes were one offs. No idea on head angles although I did read they were based on R45 frames as quicker handling. No idea what is true or not and that is the problem. Front ends are not a problem as they modded Maico yokes/forks and front wheel to fit. tanks look like 78 Maico tanks to me but they may be one offs. No idea about the seat unit. can anyone help or point me in the right direction? By any chance has anyone ever done this before?

I would post a couple of pics but no idea how.

Thanks in advance
 
:eekGood Afternoon and Welcome Rupsol...
firstly have a browse of this thread >>>

http://www.ukgser.com/forums/showthread.php?t=226472
Camille is a '84 Froggy BMW
one of the last Twin Shock Dakar bikes...

IIRC Syco has lowered the seat height from 39" :eek: to a mere 36"

Lots of details of earlier bikes will be found on that thread also :rob

Now get a crate of whatever you normally drink and read this
http://micapeak.com/bmw/gs/gs_rally.htm
Drooling is acceptable:drool:drool:drool
 
Have a look here http://www.advrider.com/forums/showthread.php?t=458147 a guy from ADVriders build up of a replica of an ISDT machine.. There are worse places to start for info :beerjug:
451747967_HzRQL-XL-1.jpg
 
holly shit

Rupsol said:
Hi chaps - new here so go easy. I am interested in building an early GS works replica(78/79) or a Herbert Schek replica for vintage enduro. I currently race National twinshock motocross (not very good at it mind and have a permanent limp;)) I have owned an 03 1150 in the past and loved it. Only bike I have ever ridden that actually fitted me as I am 6ft 9! So I am not a total beemer virgin.

I know very little about these early ISDT bikes. Have seen lots of pics on the web and read a bit as well but no idea what the specs were. Bike needs to be as lightweight as possible (Schek got his down to 130kg apparently) and I know they used certain cranks and cases to make the engine as slim as possible. I believe the cradles were fairly standard with brackets removed and strengthened in places and the subframes were one offs. No idea on head angles although I did read they were based on R45 frames as quicker handling. No idea what is true or not and that is the problem. Front ends are not a problem as they modded Maico yokes/forks and front wheel to fit. tanks look like 78 Maico tanks to me but they may be one offs. No idea about the seat unit. can anyone help or point me in the right direction? By any chance has anyone ever done this before?

I would post a couple of pics but no idea how.

Thanks in advance
Click to expand...

dude you'd make camille look small:eek the only advice i can give you is get a good photo library together cos you'll spend a shit load of time pawing over photo's trying to eek out the details, one of the biggest issues with camilles rebuild is the lack of good pics and the mish mash of info about the bike. most of the stuff you'll need will be specially made as nothing is off the shelf so you'll need to find out who can do what etc. for example it took me 12months to find the right fork stickers and about 2months to find someone who could make the right ohlins shocks so prepare to spend alot of time researching on the net. the satifaction on getting the right bits and seeing it all come together is huge and knowing you'll end up with a truely unique bike at the end, well i'll let you know when i get there.
if you need any help or advice please feel free to pm me and i'll do my best to help:thumb
 
I'm in the process of translating this (to post on this forum, with the agreement of the original author - if he's happy with my stumbling efforts) --> http://2-ventiler.de/vbboard/showthread.php?12963-Die-Laverda-BMW-GS

The item is an investigation into the well known, but seldom expanded, story about BMW's collaboration with Laverda and includes some input (not particularly complimentary) from Herbert Schek.

I'll tack it onto this thread when it's done --> http://www.ukgser.com/forums/showthread.php?t=259786
 
GS

Thanks chaps - some serious food for thought there. Just to clarify IF I build such a bike it will be used in twinshock classes. So it wont be a garage queen. It will have a maico front end tank and seat aka Scheks bike and i will probably stick to the twinshock setup. The early mono would be twinshock legal as no linkage. I did mean to ask what would work best with the bevel drive? Any ideas.

The ATV thread is really interesting but he seems adamant on trying to make a modern bike out of an old one. He is also copying a works frame so lots of fabrication involved. I am surprised he is not trying to make it from Ti:thumb

Anyway - I am sure that the schek bikes were based on standard frames with strengthening and lightening mods. I am sure Schek didnt fabricate a complete frame from new in his shed. i may be wrong of course. i have been emailed by another twinshock mxer in Germany who knows a chap who has build a couple of them. the later 78/79 replica is based on an R100/6. I am trying to get more info on frame specs and parst used etc.

There maybe alot of questions in the future so bear with me. I know very little about the old BMWs
 
Rupsol said:
I know very little about these early ISDT bikes. Have seen lots of pics on the web and read a bit as well but no idea what the specs were. Bike needs to be as lightweight as possible (Schek got his down to 130kg apparently) and I know they used certain cranks and cases to make the engine as slim as possible.
Click to expand...

It is extremely difficult to reach 130kgs. HPN claims 132kg for a 1980 Sixday GS but they are building a "soft-replica" right now and it will be at least 150-155 kg.

This bike is very customized and it's still 145 kg: http://www.advrider.com/forums/showthread.php?t=30044
Erik describes some of the modifications in post 12.
 
GS

Heres one of me on my Husky Rotax 600. Will I look an idiot riding a BMW at a twinshock motocross race? :beer:
 

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Nice pics :thumb2

I'll follow this thread with interest - I know squat about airheads but I like reading about them and especially people doing something different with them like you and Syco.

Somewhere deep in my soul there's a hankering for a mono...
 
jesus

Rupsol said:
Heres one of me on my Husky Rotax 600. Will I look an idiot riding a BMW at a twinshock motocross race? :beer:
Click to expand...

dude you make the husky look like a pitbike. you need to build a bike like camille at least then i't won't look so tiny. my advice would be to extend the swing arm by at lease 100mm that will give you the extra height and maybe some 70mm extenders on the forks. build it in the style of the 79 bike but build it to suit your size:thumb2
 
GS

sycomoto said:
dude you make the husky look like a pitbike. you need to build a bike like camille at least then i't won't look so tiny. my advice would be to extend the swing arm by at lease 100mm that will give you the extra height and maybe some 70mm extenders on the forks. build it in the style of the 79 bike but build it to suit your size:thumb2
Click to expand...

lol thats been said many times - that Husky is a big bike as well.
 
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