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Old 05-24-2011, 03:27 AM   #1
ontic OP
 
Joined: Jul 2008
Location: Melbourne
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Ontic's 1981 R80G/S build-up thread

The time has come,
here's the thread I've been meaning to start for a long time, the progress to date, the plans to come, and the questions arising...

It started with a walk in the bush. I was just beginning a renovation on a friends property in a forrested zone by the river not too far from my city. I'd spent the day cutting up a big old rusted watertank and piling it into a skip.
Now that the watertank was gone, and I got thirsty, I had to walk next door to fill up a large water cooler from their rainwater tank...
so,
what do I find but this,





A damsel in distress!

I'd wanted a R80G/S for quite a while. In fact it was the bike I wanted before I settled on my R90/6 (because G/S's were too hard to find and too expensive!)
This old girl was looking very neglected. Sitting out here in the weather when there was a perfectly good shed not far away where it could have sat under shelter.
The little details all pointed to general neglect and lack of care....



Anyway, to cut a very long drawn out story very short: I put the feelers out, found out the owner was wanting to sell, but hadn't advertised yet, and we worked out a price. I bought it and rode it home 8-9 months ago.

Lets see,
condition:
Speedo, cactus.
Battery virtually dead.
Starts easily and runs very well.
Shifter linkage is loose from a destroyed bush, but still it shifts OK and gearbox feels fine.
Biggest scare is a bit of knocking coming from the front of the engine once it has warmed up and settles into a low idle... sounds like a loose timing chain.... I HOPE it is a loose timing chain!
There is all sorts of rust and corrosion and damage from sitting out in the weather and being treated hard.
thats a start at least...

It has rusty stainless steel headers- later found out to be home made/custom, and a staintune exhaust, later found out to be adapted from another bike.

The rear shock was leaking and on the test rides and the ride home just bounced along hopelessly. Turns out it is an old Koni and after pulling it apart it is most likely un-repairable.




So:
I had bought this thing for a pretty good price, but at a time I really should not have bought another bike, so it had to just sit there for while until I figured out my plans and gather funds to start.

I started pulling things apart and putting them back together.

Rear shock: as mentioned, cactus.
Speedo: pulled it apart- not pretty. Nothing worked, everything rusted, seized and/or broken. During my efforts to fix it a fellow boxerworks member donates a R65 speedo and I manage to cobble together a working G/S speedo between the two. This is a long story cut short. Here's the photos






one of many rusted, swollen and seized parts: this one repaired by electrolysis rust removal





silver gear on top right was spinning, and the shaft running through the white gears on the bottom for the trip meter was completely swollen and siezed: again, electrolysis and a lot of patience and persistance repaired this part.



so, while the speedo hung out in parts in a box I gradually fiddled with other things...
swapped on some appropriate valve covers..
earlly stages of cleaning things up. Heavily corroded.
Uncleaned side,


'Cleaned' side


as you can see, a hell of a lot more work to do yet.


anyway,
eventually I fixed my speedo.
it now works and looks nice too.


There was a lot of work in this, but I won't go into it unless anyone is interested.
One may notice I have reset the odometer. Due to the non-matching frame/engine numbers on my bike I was under the impression that the engine had been swapped at some point- and combined with a speedo/odo that had not worked in a while I didn't put too much importance on the numbers that were showing... since then I have learned that the numbers of this era of bmw may have come from the factory not matching??
Anyway, I know the insides of this thing like the back of my hand, so I may re-set the thing to the numbers I got it with... we'll see.
more on that later maybe.

Next post coming up:
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Old 05-24-2011, 03:56 AM   #2
ontic OP
 
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So,
what's the plan???

Need a new rear shock... local options were expensive, even the cheap ones So, I started preparing for a painful hit to the wallet and looked into other options than buying in Oz.

Front forks- not too inspiring.
Front end swap being dreamed about and plotted.
First I was going to do a GS 40mm Marzocchi swap- but now I am headed towards a 50mm WP extreme front end.

Other than that a general 'rebuild', not resto, I wanted to build this bike into a competant tour-anywhere dual purpose beasty that could handle dirt a LOT better than my R90 can. Sometimes I get a bit OCD about things, other times I get a bit 'whatever' and 'she'll be right'... you'll be seing a fair bit of both over this thread.

I've ummed and ahh'd about extending the swing arm and raising rear and front suspension travel and ride height and am still undecided. I'll be putting the WP50's in at a lowered (to stock G/S) height to begin with and deal with that issue at a later date.
The frame will be stripped and painted or powdercoated, still not decided which.
Also not decided whether I will do any frame re-inforcements.

In the mean time, between planning and replanning I just pottered along doing what I could.
My nasty home/made headers were begging for a bit of love. These things were stainless but heavily corroded and had dints and grooves and imperfections all over them from the less than ideal pipe bending process they were made in.
Here is some of the OCD stuff...
starting work on one on the right


a bit more detail on the grooves and stuff,


fast forward through angle grinders with flap discs and many many many hours of sanding, polishing, re-sanding, re-polishing, ad-nauseum... we get this



Yeah, it's a G/S and will be treated rough, but I wanted to start from scratch with a good finish and let the patina develop from then on... and I was way sick of looking at my horible rusted chromed, repaired and re-welded headers on my 90/6. (and I had nothing else to do but read on the net and troll german ebay and wait wait wait...)

bringing it up to present:
A little while ago I settled on an Ohlins BM317 rear shock as the thing to buy, and all that remained was to find an international seller who would send it to me and pony up with the dollars.
For a nice change, our exchange rate was BRILLIANT. I paid for this at about Aus$1=US$1.09.
Arrived a few days ago.
Thanks Dan


Next. I wanted a big tank. Not just because I want a long range at times, but also because I've had a lot of troubles on my 90/6 with load distribution when hauling all my camping and traveling gear- the back gets too heavy and the front too light- not so bad on the road but sometimes very bad on the dirt. I want more weight up front and a larger tank fits into this...
so,
lots of trolling of german ebay.
I found a BIG tank that took my fancy, an alloy one, that I hadn't heard of before.
Anyway, I won the bidding on a Sauer 45 Liter alloy tank made specifically for the G/S...



This morning a BIG package arrived....
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ontic screwed with this post 05-24-2011 at 04:07 AM
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Old 05-24-2011, 04:10 AM   #3
BROTOWNBOY
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I like where this one's heading
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Old 05-24-2011, 04:54 AM   #4
ontic OP
 
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Here is a few ebay photos of the tank






damage




anyway,
I'd found some other images on a german forum showing this same tank in a different guise: things looked promising. I really like it with the GS single seat. I was planning for a G/SPD single seat, but may go down the route of trying to fit a GS single seat to my G/S subframe, or look into swapping to a GS subframe and seat...
not sure yet,
discussion of the possibilities and consequences of either option is welcome




I also found this image from Sauer's own site
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1981 R80G/S
1994 XLR250R
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Old 05-24-2011, 05:28 AM   #5
ontic OP
 
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Location: Melbourne
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after unwrapping the HUGE box this tank came it I was a little suprised.
Yes, it was big.
But, it also STANK.
Don't let anyone tell you you can't get a used tank sent by airmail. Don't let anyone tell you you can't get a used tank that stinks of gasoline and is coated in grease and grime and stinking oil posted by airmail
The seller said it didn't smell at all and he would clean it out with hot soapy water anyway.
I opened it in the living room- my partner could smell it in the shower in the bathroom!
Either way it made it through customs so I think I got pretty lucky there.



straight away, after giving it a thorough clean and degrease, and peeling off the stickers, I set about starting to 'improve' the major dent.
I took a nice size comparison photo between the original G/S tank and the new Sauer tank, but I seem to have lost it,
I'll take another one tomorrow.

Here is the dent


hard to see well.

here is the approach,
old hammer head + length of steel + welder


hacksaw (left my angle grinder with cut-off disc at mates place)


give it a blast on the grinder, freshly decorated with a sticker from the Sauer tank (to remind me to wear eye protection)


and we are ready to go


This 'tool' was able to reach straight through the fuel hole in the top to the dent and with a bit of beating and tweaking later, I don't seem to have done any permanent damage and in fact I have actually improved things to the point where I will be happy to fair over the remains ready for the repaint.
Again, it is hard to actually see what is going on here.



now some photos on the bike,

all these crappy photos are from my old mobile phone camera, so apologies for that. The colour of this tank is interesting, and doesn't travel well digitally. It is a dark greyish sort of invisible purple colour, and then on the all the corners there are dark greyish sort of invisible green accents
I don't mind it actually, it is quite unique and distinctive, but it will go.

anyway,
here she is,






fitment stuff
from above at full steering lock


from below at same


here's some details of the tank,
I don't know what these welded on strapped mounting-like points are for. Ideas?


heres the underside







personally, I LIKE this tank, it fits me well, and IMHO it works nicely with the classic airhead lines.




that's it for the moment.
there are a few points I'd like advice on which I will take up later,
cheers,
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Old 05-24-2011, 08:19 AM   #6
GPzPop
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why are you building my dream bike halfway around the globe from me

wow, I like the last photo with the new tank - Sauer really did a great job in keeping the bike's lines flowing into the new contours. I actually think the old paint looks great - old patina against the new polished headers!

do you think the aluminum tank might look good ... polished??

--S
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Old 05-24-2011, 09:07 AM   #7
ontic OP
 
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Quote:
Originally Posted by GPzPop View Post
wow, I like the last photo with the new tank - Sauer really did a great job in keeping the bike's lines flowing into the new contours. I actually think the old paint looks great - old patina against the new polished headers!
Cheers,
yeah I agree, for a really big tank, which it is, I think the bikes lines flow incredibly well. I have nothing at all against the big acerbis or HPN tanks, and this is purely a personal thing, but the lines of both of them don't do much for me. This tank on the other hand...
each to their own.
I can't get too precious with the tank... being alloy, and being this big- any tip-over is likely to add some fresh dents pretty easily.

I do like this old paint, and I love a bit of patina, but it is just a bit too rough for me to keep it like it is I think- especially once this bike is finished. It is pretty safe to assume that this is not 'original paint' I believe, as I have found a fair few faired over small dings in the tank, over which this paint has been done. So I don't feel like I need to be worried about preserving the originality of the tank or anything.
Also, while it looks fine in some spots, and would have looked fantastic when freshly done, this paint is probably not the best quality or is just a bit old and worn now. Its a bit soft, scratches, and flakes off easily on a few bits that don't seem to have been primed properly.
I am actually looking forward to doing a nice job on the tank- but really don't know what colour to go for. SUGGESTIONS WELCOME.
One thing is for sure- though I like the odd and unique colour it is now- I NEVER would have chosen it out of thin air!

Quote:
do you think the aluminum tank might look good ... polished??

--S
oh you evil bastid! I really don't need that sort of encouragement. Polishing really brings out my OCD tendencies. I spent quite a while waiting for this tank to arrive and have spent a lot of time thinking about polishing it, or at least part of it. The cut outs for the knees was what I was mainly thinking of polishing, and this could probably be done quite easily.
However, given the amount of skimmed fairing over some the tank and the amount of very small dings that have been faired in, it would be quite a bit of work to polish the whole tank nicely- and virtually impossible to do perfectly as the baffling inside the tank severly limit the degree to which dents can be repaired without cutting into the tank.

As it is, with a good sand, an etch prime and fair it should paint up beautifully.
Originally I was planning on a black themed bike. Though with a tank this big I am worried that a black tank won't look so great... not sure how to explain it, but I am thinking for this size of tank, white or coloured might look a bit better... black might just be a bit blimpish.. dunno, we'll see. Those are the fun bits.
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Old 05-24-2011, 09:20 AM   #8
Airhead Wrangler
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Quote:
Originally Posted by ontic View Post
I don't know what these welded on strapped mounting-like points are for. Ideas?
Probably for a tank bag. If I wanted to put tankbag mounting points on my tank that's probably right where I'd put them.

That's a great looking tank. I don't think I've ever seen one of those.
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Old 05-24-2011, 09:22 AM   #9
bgoodsoil
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That's a good looking tank. The tank bag mounts will come in handy if you do some serious traveling.

Good job on fixing the speedo. Oughta last at least 6 months.
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Old 06-18-2011, 07:05 AM   #10
Lornce
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Interesting thread... but needs more weapons.






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Old 06-18-2011, 08:59 AM   #11
ontic OP
 
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Cheers Stagehand,
it is a great drop indeed. I've got a weakness for good brown spirits of many types, and for a while was quite settled on whiskey, however Mount Gay Rum has become a bit of staple nowadays for my bike rides.
Only thing is it can be a bit hard to find in some of the backwoods country towns here. And there is not much good to be said about Australian rum IMO. I think I have discovered the pattern- we have a bit of a redneck association with rum here. However, in a lot of country towns, especially redneck ones, not many 'blokes' would be naturally inclined to buy a bottle of booze labled 'Gay'
So there's the dilema. In my efforts to buy this spirit in quite a few places it seems to be a case of- a little bit redneck- not so good- they probably like a bit of rum, but not enough to really appreciate it, and thus I can't find Mount Gay anywhere. In a real good sorta-spooky redneck place- counter-intuitively- much better prospects- maybe they like their rum enough to appreciate a good one over a shit one and not care about the lable?
I dunno, it is just a theory that seems to play out.


Lornce,
Thats a very nice, finely looked after and maintained lump of metal and timber! I'm not much into guns or weapons myself. I have no objection to the them for hunting, for food or necessary pest control, but in my country at least I see little reason for handguns. I do know better than to try to argue this point with someone from North America
As far as weapons go, in my thread one will have to be happy with badly wielded tools doing damage to undeserving bike parts, and collapsable fishing rods damaging fish.

Heres a bit from my 6 week ride over christmas/new year to keep both you and Stagehand happy

Fishing for trout on the Thredbo River,
I get lucky,


weapons and ammunition used


Venhill featherlite clutch cables are excellent- especially when they break after a few thousand Km's in the middle of nowhere and you thank your lucky stars that you brought your old one. What they are excellent for is stashing in your pack for later unthreading and using the stainless steel wire to stitch a freshly caught and cured trout to a stick


Of course, for a slow smoke it is nice to have something else to cook up.


Of course, by the time it was smoke up, some bastard had finished the rum.


So, I had to pack up camp, take my trout and find another bottle of brown spirits for my next camp (had to settle for Jamesons in that particular town).


Cheers,
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Old 01-23-2014, 11:17 PM   #12
jian var
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Hi, I have been watching all the nice things that you do and I would like to ask you guys where i can buy triples for a wp4357 front for my r100gs and at which price? To tell you the truth i am a bit lost with all the info i read...
This is the bike I am trying to built!!!
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Old 01-24-2014, 03:29 PM   #13
GrahamM
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Originally Posted by jian var View Post
Hi, I have been watching all the nice things that you do and I would like to ask you guys where i can buy triples for a wp4357 front for my r100gs and at which price? To tell you the truth i am a bit lost with all the info i read...
here is a source that seems to stock them:

http://www.swt-sports.de/de/fahrgestell/gabel-zubehoer

pretty dear.

Guy at hendersen is in the process of machining several varieties at the moment. He may have a configuration almost ready for you

http://www.hendersenprecision.com/

I am putting 4860s on my g/s modified to the g/s stock height. I am not going the extra suspension.
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Old 01-23-2014, 11:19 PM   #14
jian var
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Until now i am trying to install the fork with the standard KTM triples but it does not seem right...
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Old 03-24-2014, 05:19 PM   #15
hardwaregrrl
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Hans, I made an edit to my earlier post about the clutch. Here's the photos of mine. It explains my problem.



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