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K100-forum.com » Technical, repair and troubleshooting » Engine and transmission » 6-gear K1100

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1Back to top Go down   6-gear K1100 Empty 6-gear K1100 Fri 21 Jun 2019, 04:15

Arlina

Arlina
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Moderator
Got a new braincracker;
I remember I read somewhere someone has managed to get the K1200 6-gear into a 5-gear K75/100/1100 housing.
But that's all I know.

Someone shine a light for my old brain? Very Happy Idea


__________________________________________________
6-gear K1100 Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

2Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Fri 21 Jun 2019, 09:00

brickrider2

brickrider2
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I've never heard of such a modification Arlina.  However, your question raises one of my own.  I wonder why someone would find a 6-speed transmission in a K1100 to be a desirable thing.  I had a modern Japanese bike with such a transmission and frankly, I found that I don't like having to shift so often.  K-bikes (all BMWs, really) have broad power bands that make them easy to ride and give good performance with 5 speeds.  What would be gained with a 6th? 
Extracting maximum power from small engines dedicated to competition -- yes, I see the worth of many speeds in the gearbox, but for BMW road bikes?  What am I missing here?


__________________________________________________
1996 K1100LT
    

3Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Fri 21 Jun 2019, 09:52

Ringfad

Ringfad
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TWB has some interesting comments on the 6 speed box in this thread

https://www.k100-forum.com/t8933-big-block-k100


__________________________________________________
6-gear K1100 Ir-log10

 ;BMW; K1 Black 1993 60K Km     ;BMW;  K1100RS Black 1996       ;BMW; K1 Blue 1990 25K Miles

 ;BMW; K1200RS Red
    

4Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Fri 21 Jun 2019, 10:05

Laitch

Laitch
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Arlina wrote:I read somewhere someone has managed to get the K1200 6-gear into a 5-gear K75/100/1100 housing.
brickrider2 wrote: K-bikes (all BMWs, really) have broad power bands that make them easy to ride and give good performance with 5 speeds.  What would be gained with a 6th?
I've only read here of TWB's K1200 engine swap into K100RS frame.

In my experience, the purpose of sixth gear is to lessen vibration of a moto at expressway cruising speed. Its use increases the rider's comfort and also tends to increase fuel economy.


__________________________________________________
1995 K75 90,000 miles
    

5Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Fri 21 Jun 2019, 11:21

duck

duck
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The only real advantage would be to get better mileage at high speed. I ride pushing 90 MPH in Montana where the interstate speed limit is 80 so you can go that fast without getting a ticket.  If you keep the throttle bodies sync'd then vibration isn't an issue but once you get up around 80 and above on a K1100 the mileage noticeably decreases.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

6Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Fri 21 Jun 2019, 17:04

robmack

robmack
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I think Larry Romestandt has done that but it's not a straight-forward swap.  You have to adapt the hydraulic clutch and fool around with the starter motor IIRC. Larry's an ex-aerospace engineer so what's impossible for us mere mortals is BAU for him.


__________________________________________________
Robert
1987 K75 @k75retro.blogspot.ca
http://k75retro.blogspot.ca/
    

7Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Fri 21 Jun 2019, 17:13

duck

duck
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robmack wrote:I think Larry Romestandt has done that but it's not a straight-forward swap.  You have to adapt the hydraulic clutch and fool around with the starter motor IIRC. Larry's an ex-aerospace engineer so what's impossible for us mere mortals is BAU for him.

Yeah, Larry does a bit more than swaps. Laughing  For the K-Gusta he custom designed the rear wheel in CAD and then 3-D printed a mockup before he built it.


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

8Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Sat 22 Jun 2019, 00:14

Arlina

Arlina
Moderator
Moderator
Logic explained; "Does it fit? No? Get lost..."
Diehard explained; "I bet you wrong!"

It was really about fitting the inside of the 6-gear into the 5-gear housing.
Had a link to the page of the builder, before a big harddisk crash Sad


__________________________________________________
6-gear K1100 Eu-log10  K1100RS/LT - R1200RT - R1100RS - Cagiva SST 350 Ala Verde - K75LT project - K75 Schurgers - K75S - K1100RS - K75RT - K75C
    

9Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Sat 22 Jun 2019, 04:20

Rick G

Rick G
admin
admin
I will say quite confidently that it would nigh on if not totally impossible.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

10Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Sat 22 Jun 2019, 04:42

Laitch

Laitch
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Life time member
Arlina wrote:It was really about fitting the inside of the 6-gear into the 5-gear housing.
Your recollection could be of an R1200C final drive gear swap which has arisen in a few discussions concerning sixth gear conversions. The owner who managed that was satisfied with the outcome.


__________________________________________________
1995 K75 90,000 miles
    

11Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Sat 22 Jun 2019, 06:04

duck

duck
Life time member
Life time member
Some "improvement" on that front can be had by swapping in a slightly taller K1 final drive on a K1100.

FD gear ratios:
K1100LT - 32/11=2.91
K1100RS - 31/11=2.82
K1 - 33/12=2.75


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

12Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Mon 24 Jun 2019, 12:44

92KK 84WW Olaf

avatar
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duck wrote:Some "improvement" on that front can be had by swapping in a slightly taller K1 final drive on a K1100.

FD gear ratios:
K1100LT - 32/11=2.91
K1100RS - 31/11=2.82
K1 - 33/12=2.75

You can get considerably taller, I think its the R1200LC inners will fit into the Paralever final drive housing. I was sent a full spec on this some time back with specific model and part nos.

As for 6 speed inners into 5 speed, it don't go. Ben Kingham at BSK investigated that one. Gearbox swap is not an option due to the frame change.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

13Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Mon 24 Jun 2019, 16:45

Pegasus

Pegasus
Silver member
Silver member
That was done by Gary Bennett here in Brisbane.
He is a forum member.
It is in a 94 Mystic Red (the best colour) K1100RS.

    

14Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Mon 24 Jun 2019, 20:35

Rick G

Rick G
admin
admin
I would like to see more as I have a 1200RS engine to go in the K1100 and was thinking of a six speed. Do you have a contact for Gary.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

15Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Tue 25 Jun 2019, 13:02

Laitch

Laitch
Life time member
Life time member
RicK G wrote:I would like to see more as I have a 1200RS engine to go in the K1100 and was thinking of a six speed. Do you have a contact for Gary.
He's a member here—GB777.


__________________________________________________
1995 K75 90,000 miles
    

16Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Tue 25 Jun 2019, 18:08

Rick G

Rick G
admin
admin
It is the rear drive he swapped. Put a 2.53 gear set from a R1200C into a pars lever K1100.
I have a set of 2.62 gears from a K1200RS and it gets a very small decrease in fuel consumption and gets the buzz out of the 100kmph speed range.


__________________________________________________
"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

17Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Thu 27 Jun 2019, 03:04

92KK 84WW Olaf

avatar
Life time member
Life time member
RicK G wrote:It is the rear drive he swapped. Put a 2.53 gear set from a R1200C into a pars lever K1100.
I have a set of 2.62 gears from a K1200RS and it gets a very small decrease in fuel consumption and gets the buzz out of the 100kmph speed range.

That 2.53 is the one I was told but you need to carefully check the part no and model because it seems to be different in different areas.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

18Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Sun 03 Oct 2021, 16:22

GB777

GB777
Silver member
Silver member
It was a 2.54 (32:13) gear set from a R1200C that I originally fitted in 2002 to the mono lever final drive of my K100 and then later fitted to my K1100RS in 2006.  I sold the K100 to a mate who still owns the bike and still has the gear set in the final drive. It increased my fuel range in the 1100 from 380km to 440km by dropping 500 rpm off top gear at 100kph. At 100kph the engine is doing 3500rpm. Due to the torque of the 1100 motor there was no noticeable loss in performance. Fitting the gears was well worth the effort.



Last edited by GB777 on Mon 04 Oct 2021, 15:49; edited 1 time in total (Reason for editing : Added more info)


__________________________________________________
Gary
'94 K1100RS Mystic Red
•Dyno Tuned to deliver 115 bhp. •Audiovox CCS-100 Vacuum Cruise Control. •Fuel Plus Version 3.1 Trip Computer. •R1200c Final Drive Gears (32/13 or 2.54). •Ohlins rear shocky. •K100 complete Aluminium Radiator fitted. •Davies Craig Thermo Switch fitted to Cooling Fan with manual over-ride. •Fuel Cap drilled and tapped to provide mounting points for accessories, including mini Tank Bag & Apple CarPlay Screen •HID Hi-Lo Headlight and every other incandescent bulb on bike replaced with LED's. •Bulb monitoring warning light no longer needed so it's now used to indicate when Side Stand is down. •LED (Halo) Front Park Light (BMW Car style).
    

19Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Mon 04 Oct 2021, 06:31

92KK 84WW Olaf

avatar
Life time member
Life time member
That's the change I have in mind but 2 K1100LTs I got have 31/11 final drive ratios.


__________________________________________________
1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011157 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 58,200 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 51,800 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 63,390 miles

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

20Back to top Go down   6-gear K1100 Empty Re: 6-gear K1100 Mon 04 Oct 2021, 09:03

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Imagine the rear frame mods required to fit a (much smaller than five speed, non-structural) six speed K1200RS/GT gearbox - which rubber mounts to the aluminium spar backbone, not a relatively spindly tube frame - into a K100/K1100 frame! Larry Romestandt did it with his Kgusta but cut the mounts from blocks of ally & etc. Still, it'd be a challenge. Easier to simply swap the final drive set as suggested.


__________________________________________________
"A long ride is the answer to a question you will soon forget!" ~ Anonymous
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT
    

21Back to top Go down   6-gear K1100 Empty k12 to k11 Tue 12 Oct 2021, 21:10

ausbrick

ausbrick
Silver member
Silver member
k 1200 engine can be fitted to a k 1100  with the 1100 drive train, the 1200 drive train mounts are completely different would require some major changes to the frame. A k100 has much the same setup as the k1100 so should fit , it also needs some minor clutch tweaks, k1200 motors are becoming easier to get than 1100 motors in Aus . I got a very noisy k1100 thinking it might be easier to fit a 1200 than rebuilding the 11

    

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