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EMSimon
10-02-2008, 10:54 AM
:ear
barryg
10-02-2008, 11:25 AM
K100RS 4valve I believe '90/'91 Looks alot like the K100RS. Uses the same KRS fairing.
dzimbric
10-02-2008, 11:51 AM
K100RS 4valve I believe '90/'91 Looks alot like the K100RS. Uses the same KRS fairing.

Any K100, including the LT after '90, they all used pretty much the same basic motor.
bikerfish1100
10-02-2008, 12:05 PM
yes on the 4 valve K100. was offered the year after the K1 was first introduced (88?), and remained in the lineup until the K1100 was brought out as the next upgrade ('93, iirc)
barryg
10-02-2008, 02:18 PM
I don't think there was a K100LT 4-valve. I think the K100LT 2-valve evolved directly to the K1100LT without an intermediate step. I'm getting old and my memory is starting to fade. :scratch
BuddingGeezer
10-02-2008, 04:01 PM
Any K100, including the LT after '90, they all used pretty much the same basic motor.

The K100LT did not go to the 4 valve head. It remained a 2 valve to generate more torque at the low end.

Ralph Sims
PGlaves
10-02-2008, 07:08 PM
In its day, the 4 valve K100RS was called "the K1 in sheep's clothing." :)
dzimbric
10-03-2008, 09:16 AM
The K100LT did not go to the 4 valve head. It remained a 2 valve to generate more torque at the low end.

Ralph Sims

Thanks Ralph, I checked the parts fiche and you are correct. The K75RT also remained a 2 valve during its production.

By the way, I do love the low end torque. I recently test rode a 2005 LT and could not justify the cost over my '90 LT. Acceleration felt about the same riding 2 up and the plastic and windshield made me feel like I was riding a golf caart.
kioolt
10-03-2008, 08:19 PM
My 91 K100LT is a two valve engine. At this years MOA rally it appears even the experts believe it was a four valve engine with a paralever rear end. I asked a question about the swing arm at a siminar about my 91 K100LT and they assumed it was four valve with paralever. I don't think they believed me when I told them it was two valve with monolever.
lostboy
10-03-2008, 09:45 PM
Some experts!
barryg
10-04-2008, 02:27 AM
Happens more than not. I've visited the BMW NA rolling Motorcycle hauler a few times. Mostly Daytona or the MOA nationals. U ask em about a BMW motorcycle more than a few years old and most are clueless. I think they hire those people for their looks and for the company's self promotion, not their knowlege of the brand.
GregFeeler
10-04-2008, 11:52 AM
This info is from the BMW Motorrad bike data sheets for world-wide production years:

2-valve:
K100RS 1983~89
K100LT 1986~91
K100 1983~90
K100RT 1984~89

4-valve
K100RS 1989~92
K1100LT 1991~99
K1100RS 1992~96
GregFeeler
10-15-2008, 08:52 AM
This makes me feel much better. For a while here, I thought I was an ignoramus for not knowing.
In the meantime I recieved this info from a contact at BMW Motorrad:

"The first K1 was produced in August of 1988, VIN-number 6372001. The first U.S. market K1 was produced in January of 1989 VIN 6365001. The K1 remained the only 4-valve K model for 2 years until the production of the first K100RS 4-valve in July 1990 VIN 0200001. The first U.S. market K100RS was also built in July 1990 VIN 6493001. No other 4-valve K100 models were made. All K1100 models were 4-valve, of course"

Thanks all for responding!

Nice contact! That's some pretty specific information. :brow