Looking for a R100S - I think... Please Advise

Discuss all things 1970 & later Airheads right here.
Souljer
Posts: 99
Joined: Wed Sep 25, 2013 4:43 am

Looking for a R100S - I think... Please Advise

Post by Souljer »

Hi,

I need some help and advice from those who are experienced with and know these bikes and their variations.

Some background:
I have some mechanical skills and used to have a 1969 Triumph TR6. So I'm used to mechanical issues, oil, and the odd nut or bolt after you've got it all back together (!?). Eventually sold it and miss working on old machinery and having some fun on the road.

I'm now looking for a BMW motorcycle.
After doing some looking around and reading various forums I think I'm focusing in on a R100 or R100S.
I still have many questions about the various models and years.

Since I come from a mid-century machinery experience I sort of like the idea of a 1977 R100S for various reasons:
• The '77 was an improvement over previous frames and had better brakes or at least more disks.
• The valve covers look vintage and have a cool "streamline" look that I like.
• There is little or no emissions crap on them as far as I know.
• Power is good without being crazy (like a modern 1100 might be).
• MPG is decent (certainly better than what I'm getting with my truck).
• It's simple enough that I can do much of the basic maintenance at home. Maybe sometimes with some help or guidance.

That said I am intrigued by the Monshock set up on the mid 1980s bikes. I've read that they handle better, etc. Oh, wait, but then there is the valve seat issue and a transmission curclip thing. Well the newer we get the more complicated the machine and the more I feel like I might not be able to do the basic work at home anymore. So as I said, I don't know what to do and I retreat back to the first year: 1977 R100S.

I also like the look of a cafe racer type - no fairings, single seat when 'She' is not on the back, etc. So I was looking at bikes that are NOT restored or museum quality time-capsules. There is no point in paying for a fantastic looking machine that I now don't have the heart to take apart or modify. However I of course want a lowish mileage bike that is mechanically sound.

I live in Los Angeles and I'd like to spend less than $4000 after DMV fees and licensing, etc.

Now here's were I need advice:
For example I found a bike that fits everything I just described exactly.
• A 1977 R100S
• He already chopped the tail and painted the tank black. He put on shorter, thinner mufflers, etc.
• I could afford it although the price was not great at $3500.
• The bike seemed to have a legitimate mileage reading of 27,000 miles.

The problems?
• Well for one the bike seemed to have a history of neglect and almost no maintenance. It seemed that each of the previous owners kind of thought, "It's got low miles and I rarely ride it, so I don't need to take it in and pay for service".
• The rear tire is probably ten years old and I'm sure no one has been in the bearings or drive splines for at least that long.
• As far as I know the bike has been stored inside a storage garage (so it's not dirty or rusty on the outside really) for at least the last five years and ridden very infrequently. It does run and I watched the guy drive it around the lot when I went to look at it. I did not want to drive it because I wanted to see if the lights worked and I was concerned the brakes might seize. It seemed okay.
• There was quite a bit of corrosion inside the tank. I could see the red liner was broken and rust had formed in speckles on the center hump. The seller's advice? "That's what fuel filters are for". :roll:
• The bike is Non Op status. So I'd have to trailer it home and deal with the DMV to get it registered.
• When doing some research at home (luckily I had the brains to take a picture of the VIN) I found that there is over $700. in back fees! And add a few hundred in sales tax on top of that depending on the price.
-So calculating a minimum of $800. of basic maintenance I offered the guy $1500. since I would have to deal with all of the above. He declined. However I'm tempted to counter saying that if he registered the bike, I would feel better about offering say, $2200.

•• Since I'm local and can pick-up he would include a new front tire and the original mirrors, front and back fenders & seat. It was a weird faded orange/yellow design. I don't think he has the fairing. Maybe a few other things that I'm forgetting.
Here is a picture of the above bike. Remember: Seller admits no maintenance, currently Non Op with over $700. in DMV fees just to get it on the road. I think if you click on the picture you'll go to a small folder I made which has a few more detail pix.
-1977 R100S-
Image

IF he pays the DMV fees does $2200 - $2400 seem reasonable to you more experienced folk? Or should I just walk away and wait for a better bike (maintained rather than neglected). Or should I start looking at later years? I find a lot of bikes for $3500-ish but they are newer with double or triple or 5x and 6x the mileage, etc.

I'm not sure what to do.
I look forward to your experienced advice, opinions and amusing stories! Thank you.
Last edited by Souljer on Thu Sep 26, 2013 10:45 pm, edited 3 times in total.
Things which are different in order simply to be different are seldom better,
but that which is made to be better is almost always different.
-Dieter Rams, 1993
Mal S7
Posts: 661
Joined: Thu Aug 05, 2010 5:26 am

Re: Looking for a R100S - I think... Please Advise

Post by Mal S7 »

Welcome.
You will be happy with an R100S
You don't want a mono by the sounds of your background and wishlist.
Save your money and buy a cared for example, even if miles are high it will be better and cheaper in the long run than a neglected example.

Cheers
Mal
Souljer
Posts: 99
Joined: Wed Sep 25, 2013 4:43 am

Re: Looking for a R100S - I think... Please Advise

Post by Souljer »

Hi,

Thank you!
I appreciate your advice and it makes it easier for my rational mind to fend off the emotional, impulsive zombie thoughts swarming around it!

I got similar advice on another forum so I feel better.
Looking forward to ideas and opinions on how to proceed.
Things which are different in order simply to be different are seldom better,
but that which is made to be better is almost always different.
-Dieter Rams, 1993
Seth
Posts: 279
Joined: Thu Aug 12, 2010 4:45 pm

Re: Looking for a R100S - I think... Please Advise

Post by Seth »

The only reason why I don't recommend a 77 (I have a 77RS and my buddy has a 77S) is the pistons are different than later years and I believe are difficult to find, if you need them. There is a flat band around the dome, where the later ones have the dome go to the edge. The head matches the pistons. So if you need 77 pistons, you may need to buy later ones and machine the piston crown to match the head. If you go to 78 or 79, I think it will meet your criteria without this issue. No big deal, but a consideration.
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dougie
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Joined: Wed Aug 04, 2010 6:19 pm
Location: Burlington Ontario, Canada

Re: Looking for a R100S - I think... Please Advise

Post by dougie »

Well just to confuse the issue.....
I had a 1987 Monolever R100RS that I converted to an S fairing/handlebars and liked it very much.
It had beefier forks and a more rigid swingarm, and was as stable as a rock at high speed.
Never had to bother with the fork alignment procedure necessary with the earlier skinny forks. I did check them a couple of times after re-assembly. They were right on, and after that I didn't bother.
So I would vote for the Monolever, even though it did not come in the S version.
I've spent most of my money on women, motorcycles, and beer.
The rest of it I just wasted.
Major Softie
Posts: 8900
Joined: Tue Aug 03, 2010 1:46 pm

Re: Looking for a R100S - I think... Please Advise

Post by Major Softie »

It's just a couple of the early 80's years that the valve recession is a big deal (82-84?). The circlip is not worth worrying about. If you rebuild a tranny, it's worth adding. If you don't, it's not like it's "likely" to bite you - it's far less likely to be an issue than the valve seats in the couple bad years.

If you really love old, go early, but if you like brakes, go as late as possible. For me, it's /5 for the genuine old classic feel, or late mono and get some real brakes.
MS - out
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dougie
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Location: Burlington Ontario, Canada

Re: Looking for a R100S - I think... Please Advise

Post by dougie »

Major Softie wrote:If you really love old, go early, but if you like brakes, go as late as possible. For me, it's /5 for the genuine old classic feel, or late mono and get some real brakes.
Yeah, I forgot that. Sportbike brakes. Those two big Brembos STOP!
I've spent most of my money on women, motorcycles, and beer.
The rest of it I just wasted.
chasbmw
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Joined: Fri Aug 06, 2010 7:40 am
Location: Bath UK

Re: Looking for a R100S - I think... Please Advise

Post by chasbmw »

An unmolested 77 S would be a good buy, the 77s were by all accounts the fastest of the airhead range and the R100S was only produced in fairly small numbers.

It's a pity that the value of that bike has been reduced by all the work done to it, but the owner still wants to get some of his money back
Charles
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Replica 1070 R90/S (based on 82 RT)
1975 R90/6
Jean
Posts: 1100
Joined: Wed Aug 18, 2010 7:43 am

Re: Looking for a R100S - I think... Please Advise

Post by Jean »

Souljer, I replied to this issue in your other post, but I'll go on with it.
I have a "78 R100s Euro model, that I bought in '82, I think...might have been '81.
It had a lot of KM on it, having been ridden by a German fellow who came to the US and ride ALL OVER the place not to mention where ever he went back home.

It's easy to work on, parts are findable, and it's still running strong. Yes, I've replaced the clutch and the rear mainseal, and oil puump seal and numerous other little piddling stuff, but it is quite a satisfactor(serious understatement) motorcycle.

In the latest AIRMAIL (ABC club newsletter) there are 3 1978 R100RS in running condition for sale ranging from $3300 to $4000.
There is ONE 78 R100s that has been stored since 2007 that has some mods with a "make-offer" Price. The ad says plainly that it needs tranny work and a battery, but a battery is really no big thing. (I use a U1-A lawn mower battery...fits OK and got lots of power and usually lasts at least 4 years.)

In the IBMWR website, there is a section for Airheads for sale, where there are probably many others listed.

An additional consideration would be an R80 from those years. They came either "plain" or in RT dressing. They are good running and quite reliable and can be had for reasonable cost. They are also easy to work on.
Clemson, SC
R100s, R75/5
Souljer
Posts: 99
Joined: Wed Sep 25, 2013 4:43 am

Re: Looking for a R100S - I think... Please Advise

Post by Souljer »

Hi,

Thanks everyone for your input. I appreciate all perspectives as I am still learning (as I stated in my opening essay) about these engines and their variations. Looking forward to reading about your experiences.

Jean, what's KM?

Where can I find this ad on line so I can have a look, see where they are located and maybe "make an offer". I'm in Los Angeles so I'd like to see it first, but I sat on the one I mention in my post so I know it fits and feels fine. Just a matter of seeing and hearing if possible before committing thousands. However if it's a fair price even considering shipping I'd be interested.

How much would a R100S that might be in decent shape but need tranny work be worth? What is the mileage, does it run, etc.?

Thanks again.
Things which are different in order simply to be different are seldom better,
but that which is made to be better is almost always different.
-Dieter Rams, 1993
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