BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]

1Back to top Go down    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.

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

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

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 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 82,800 miles

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

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)

"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum