1984 BMW R100 value help

[Perazzimx14]

So I have a lead on what I am being told is a 1984 R100. What I could see of it the left side, its mostly there but dirty crusty and rusty. Tailight is broken off and I'm sure many other things. I'm told it runs but w/o hearing it roar to life its a non runner.

Are parts remotly avalaible?

Asking $1,000 I counter offerd $475 he came back with $500 even??

What say you?

[dxhall]

I haven’t had any problems getting the basic stuff for my ‘84.  It’s in nice shape, 33,000 miles.  I thought $4400 was fair when I bought it last year.  It’s a last edition RS with nice fairing, which probably raised the price.

[Perazzimx14]

Just got off the phone with a buddy and his thoughts are its $500 worst case is part it out.


I told the seller I'd like to see the entire bike and if it right side looks the same or better as the left I'm in a $500

[oldbike54]

 We will need more info . Is it an R100R , S, RT , CS ? Clear title , all there , are the snowflake wheels in good shape ? If he is already willing to come down to $500.00 , offer him $487.50   Oh , parts will be no problem , unless it needs a fuel tank , those things are not cheap . That will be a last edition R100 , still fairly high compression , big carbs , etc . In good fettle it will run all day long a 90 MPH 2 up loaded with gear .

 Dusty

[Perazzimx14]

We will need more info . Is it an R100R , S, RT , CS ? Clear title , all there , are the snowflake wheels in good shape ? If he is already willing to come down to $500.00 , offer him $487.50   Oh , parts will be no problem , unless it needs a fuel tank , those things are not cheap . That will be a last edition R100 , still fairly high compression , big carbs , etc . In good fettle it will run all day long a 90 MPH 2 up loaded with gear .

 Dusty

Side panel had R100 that's all I could see. Looking at pics on the internet I'm guessing a CS?? Rear wheel looked to be in good shape couldn't see the front. What I could see it all look there but tomorrow will be the tell tale when its coaxed from it current resting place.


It is supposed to have a title signed by the previous owner along with a photo copy of the previous owners drivers license. Not ideal but enough to work with.

[oldbike54]

Side panel had R100 that's all I could see. Looking at pics on the internet I'm guessing a CS?? Rear wheel looked to be in good shape couldn't see the front. What I could see it all look there but tomorrow will be the tell tale when its coaxed from it current resting place.


It is supposed to have a title signed by the previous owner along with a photo copy of the previous owners drivers license. Not ideal but enough to work with.

 If it has a drum rear brake it is a CS .

 Dusty

[Perazzimx14]

If it has a drum rear brake it is a CS .

 Dusty

Out of the entire bike I could maybe see 30% of it. The right side was not visable so I couldn't see if it was drum or disc. Honestly didn;t pay that much attention to it. What I did see was something that was reminisant of my Eldo when I 1st layed eyes on it. A dirty crustly old bike relagated to an out building.

No matter it'll give me $500 worth of entertainment over the winter just fiddeling with it. 

[oldbike54]

Out of the entire bike I could maybe see 30% of it. The right side was not visable so I couldn't see if it was drum or disc. Honestly didn;t pay that much attention to it. What I did see was something that was reminisant of my Eldo when I 1st layed eyes on it. A dirty crustly old bike relagated to an out building.

No matter it'll give me $500 worth of entertainment over the winter just fiddeling with it.

 Yes , it will . Looking forward to more on this .

 Dusty

[radguzzi]

If it has a drum rear brake it is a CS .

 Dusty

Well, not necessarily, this is an '83 R100, just a straight R 100, not a CS although it looks a great deal Like one, rear cowl and all that. 

If that thing IS a CS, buy it.   Yes, worth the 500 bux for the entertainment if nothing else..


Best,
Rob






 

[oldbike54]

 ^^^You are of course correct Rob , gonna blame a bad memory for that 

 See your's has a Brown's stand 

 Dusty

[MadMike]

What would you say is the best years for the R100 motors. Does it follow the usual "purchase the latest" which in the Airheads case would be 1995?
I always keep an eye out for an RT and see one in my future.

[oldbike54]

What would you say is the best years for the R100 motors. Does it follow the usual "purchase the latest" which in the Airheads case would be 1995?
I always keep an eye out for an RT and see one in my future.

 It depends , the '80-'84 1,000 CC engines made a bit more power than the second gen '88-'95 motors , some say the later bikes handled a bit better.

 Dusty

[ohiorider]

As Dusty mentioned, the pre 1988 engines came with 40mm Bings, and I think the exhaust ports may have been 40mm also.  I think some of the non-US bikes may have continued with the 40mm intake and exhaust ports, (Dusty?)  Factory hp ratings on some of the older R100RS bikes was in the mid to high 60hp range.  By comparison, the factory rated my 1991 GS at 58hp.

Bob

[wirespokes]

Let us know how the meeting turns out. An 83 R100 is a good one to bring back - they've got nikasil cylinders, 40mm bings, decent brakes, light flywheel, stronger and lighter acting clutch, plus they handle well.

Also, unlike Moto Guzzi and the V7S, when they hit a home run with the 90S, they continued that bodywork for ten more years and bits of it for a long time later.

For five bills it's hard to go wrong. The wheels and tank, if decent are worth that.

Parts? Unlike Guzzis, parts are everywhere - used and new. Guzzi parts are available, but not in the amount available used for airheads.

Yes, the 85-95 bikes handle a bit better, but the engines got strangled from about 77 or 78 and power started dropping along with fuel efficiency. Cam timing got changed, compression went down, jetting got weird (similar to what happened with the Guzzis), but in 1981 a lot of changes were made - that's when they converted to Brembos, lightened the flywheel, beefed up the clutch, changed the shifting mechanism - stuff like that.

[oldbike54]

 Actually an early 1,000 CC engine , '79-'84s were as potent as the earlier 900's , the R90S was the exception with the Dellorto carbs , but from personal experience an early R100 will run right with the R90S . Don't get too bogged down in the small differences performance wise in the early large displacement airheads , final drive ratios have more to do with how much *sparkle* those bikes had than what the engine specs were .

 Oh , Bob , seem to remember that the Euro models from '88 on were the same as US spec engines , although the transmission and final drive ratios were sometimes different . (Don't make any bar bets on my memory  )

 Dusty

[PeteS]

As Dusty mentioned, the pre 1988 engines came with 40mm Bings, and I think the exhaust ports may have been 40mm also.  I think some of the non-US bikes may have continued with the 40mm intake and exhaust ports, (Dusty?)  Factory hp ratings on some of the older R100RS bikes was in the mid to high 60hp range.  By comparison, the factory rated my 1991 GS at 58hp.

Bob

The only US airheads to get 40 mm exhausts and sport cams were the '77 sports and police bikes.
All the 83s had 38mm exhausts. CR was less than 9:1. Head design changed from the classic hemi with flat squish bands like the Guzzis to slanted squish bands. Even with the lower compression they pinged like crazy.
I dual plugged and shaved the head on my '83. That helped reduce pinging. Then bored the exhaust ports for 40 mm pipes and installed the sport cam. The eliminated all the pinging and got 62 RWHP on a dyno. That same day an identical but stock '83 only got 47 RWHP.

Pete

[oldbike54]

The only US airheads to get 40 mm exhausts and sport cams were the '77 sports and police bikes.
All the 83s had 38mm exhausts. CR was less than 9:1. Head design changed from the classic hemi with flat squish bands like the Guzzis to slanted squish bands. Even with the lower compression they pinged like crazy.
I dual plugged and shaved the head on my '83. That helped reduce pinging. Then bored the exhaust ports for 40 mm pipes and installed the sport cam. The eliminated all the pinging and got 62 RWHP on a dyno. That same day an identical but stock '83 only got 47 RWHP.

Pete

 No snark intended , but neither of my 1,000's ever pinged , even under heavy load , Neither did either of my /5's . Sounds like something was wrong with your airhead .

 Dusty

[jas67]

We will need more info . Is it an R100R , S, RT , CS ? Clear title , all there , are the snowflake wheels in good shape ? If he is already willing to come down to $500.00 , offer him $487.50

Give me the contract info, I'll give him $512.50.   

[oldbike54]

^^^Troublemaker 

 Dusty

[jas67]

^^^Troublemaker 

 Dusty

 

I'm just a bit envious that I can't find deals like that.   Seriously, a running complete '84 (or '83) R100, or ANY airhead for that matter is a good deal at $1,000.

[oldbike54]

I'm just a bit envious that I can't find deals like that.   Seriously, a running complete '84 (or '83) R100, or ANY airhead for that matter is a good deal at $1,000.

 We haven't seen any pictures yet , it could have bent forks , a bashed in fuel tank , a cylinder torn away from the crankcase , broken fenders , no headlight , cooties , the heebie jeebies , and what an old airhead guru from years ago referred to as *poorly planned owner modifications*

 Dusty

[jas67]

We haven't seen any pictures yet , it could have bent forks , a bashed in fuel tank , a cylinder torn away from the crankcase , broken fenders , no headlight , cooties , the heebie jeebies , and what an old airhead guru from years ago referred to as *poorly planned owner modifications*

 Dusty

Good point.

I'm waiting for the notice of what day he's taking it to the dump, because he can't get his price for it.   

[Perazzimx14]

Good point.

I'm waiting for the notice of what day he's taking it to the dump, because he can't get his price for it.   

No more notices. Now I just throw stuff away. So much less drama!

[Daleroso]

If I recall correctly early 80's R100's cupped/ate valves due to fuel changing issue. The airhead club offers a LOT of info.

[fubar guzzi]

   I have about any part u need---rt fairing   saddle bags    probably even find ol skin from burns +big hunks of knuckle tissue,as always Fubar will give you a good shellacking, no thats waxing no that isn't right either----howes about u just buy me a beer at Cedar Vail 

[oldbike54]

If I recall correctly early 80's R100's cupped/ate valves due to fuel changing issue. The airhead club offers a LOT of info.

 One of mine swallowed a valve at 100,000 miles , and one of my /5's broke a valve at about 150K , so yeah , they will , but usually not until serious mileage . Of course both of those bikes lived at 5,500 RPM's , or more . I was in a hurry to get places 

 Dusty

[jas67]

Lots of good Airhead technical info, tips, etc here:
http://bmwmotorcycletech.info/technical-articles-list.htm

[radguzzi]

^^^You are of course correct Rob , gonna blame a bad memory for that 

 See your's has a Brown's stand 

 Dusty

Unfortunatly Dusty, this is not mine... yet.  I too had hoped that is would end up being a CS...!

I service this R100 for a friend eevery other year or so, have several times.  This past Spring I offered to Jeff to just leave it and I would pay him the difference on the service bill, he thought about it but finally declined.  Hopefully he will relent one of these days and it can stay here.

Yes, I installed the Brown's stand a few years ago, just a sweet R100, a bit tatty but runs great, handles well.  Neat rig.

Rob___

[Antietam Classic Cycle]

[radguzzi]

What would you say is the best years for the R100 motors. Does it follow the usual "purchase the latest" which in the Airheads case would be 1995?
I always keep an eye out for an RT and see one in my future.

The early 80's were just perfect in my estimation.  That did not stop me from buying this '91 RT a year or so back... Has all cases as well.