BMW K bikes (Bricks)

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1Back to top Go down   Yet another 1985 "hotter cams" thread Empty Yet another 1985 "hotter cams" thread on Sun Jun 11, 2017 2:36 pm


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

2Back to top Go down   Yet another 1985 "hotter cams" thread Empty Re: Yet another 1985 "hotter cams" thread on Sun Jun 11, 2017 3:00 pm

92KK 84WW Olaf

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 Alaska 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 103,800 miles
1983 K100RS 0011171 Fricka 606 29,495 miles Damn K Pox Its a Bat outta Hell Now 36,188  miles

3Back to top Go down   Yet another 1985 "hotter cams" thread Empty Re: Yet another 1985 "hotter cams" thread on Sun Jun 11, 2017 8:39 pm

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 9:22 pm; 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 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now

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