BMW K bikes (Bricks)

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Life time member
Life time member
I'm still not convinced on this "myth" but have been looking into it some more just out of Kuriosity.

I have two set of cams on hand. One set from a US K100RS manufactured in 7/84 and another set from a 10/85 K100RT. There is a difference in them in the numbers stamped into them. The early ones are marked 125 and 126 while the later ones are 1450125 and 1450126 so apparently they were produced from different molds.

In poking are Fleabay for different countries I was able to make out the numbers on some of the cams up for sale.

On Germany and UK sites I found some 83 and 85 (model year I assume) which have the short numbers and on the Canada site I found some 87s that have the longer number.

Yet another 1985 "hotter cams" thread K100_c10

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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT

92KK 84WW Olaf

Life time member
Life time member
Has anyone ever checked if they are the same profile and lift?

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 45,920 miles.
1983 K100RS 0004449 Odette R100 colours 58,000 miles. Sprint fairing now 61,190 miles

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

Rick G

Rick G
Yeah I went through it some years ago and the inlet cams open 20° later on the cams that were for the NA market. Made like that so as to in effect lower the compression ratio by not allowing as much charge into the cylinder, this in turn lowers the combustion temperatures which causes less oxides of nitrogen causing less pollution. The earlier cams AFAIK were never available in US because the K100 was not sold there until 1985.
The US and Australian cams for the 16V engines were the same but the K1200 cams were the same and the so called problems were solved using more advanced ECUs
If you are really lucky the "hotter" cams will deliver around 2 extra horsepower.

Last edited by RicK G on Sun Jun 11 2017, 20:22; edited 1 time in total (Reason for editing : Extra info)

"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 2004 K1200GT (crashed I lived it died) 1999 K1100 LT.

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