BMW K bikes (Bricks)

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1Back to top Go down   New K100RS owner from Norway Empty New K100RS owner from Norway on Sat Oct 14, 2017 4:01 pm

ExcelKebab

ExcelKebab
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New member
After reading tons of forum posts and watching hours of youtube videos, I finally bought a 1985 K100RS with 55.000km on it, and now I’m not sure what to do with it. My intention at first was to build a café racer, but the more I learn about the bike, the more I like the original design. I’m at a point where it almost feels disrespectful towards the engineers at BMW to consider messing with the brickalicious stock version. And what would Chris R Harris think??

Anyway, while pondering these big questions, I plan to fix a couple of possible problems; a «knocking» sound coming from somewhere around the gearbox/rear of the engine, and a suspiscious «hissing» noise from somewhere around the fuel tank. Gonna trawl the forum for info, but any hints or tips would be much appreciated!

    

2Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Sat Oct 14, 2017 4:18 pm

Born Again Eccentric

Born Again Eccentric
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Welcome along ExcelKebab,

Great choice of bike, good decision not to cafe chop her (at least not until you've given her a chance to show what she can do) and some great K owners in that there country of yours.

Hissing in vicinity of fuel tank - quite likely to be the noise of the fuel pump running (and completely normal) - and that's a real good start to a well running bike. As for the knocking, I've no experience in that department, but some recent posts on the subject which might help, if not I'm sure that someone will provide some guidance.

Enjoy


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New K100RS owner from Norway Uk-log10 New K100RS owner from Norway Sco-lo15New K100RS owner from Norway Eu-log10
                              Paul  New K100RS owner from Norway 905546712

"Heidi" K100LT 1991 (Grey) (VIN 0190172 Engine No. 104EB 2590 2213) - 5th owner. January 2014 (34,000 - 61,000 miles and counting....)
"Gretel" K100LT 1989 (Silver Grey) (VIN 0177324 Engine No. 104EA 2789 2211) - 4th+ owner. September 2015 (58,500miles and counting....). Cat C Insurance write-off rebuild Feb 17
"Donor" K100LT 1990 (Red)  (VIN 0178091 Engine No. 4489 2024) - 6th & final owner (crash write-off now donor bike).   June 2012 (73,000 miles) to November 2013 (89,500 miles)
    

3Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Sat Oct 14, 2017 4:25 pm

ExcelKebab

ExcelKebab
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Thanks Paul!

    

4Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Sat Oct 14, 2017 5:12 pm

club_c

club_c
Life time member
Life time member
Welcome. Re knocking sound. Is it pronounced when the motor is cold but disappears when it's warm?  If so it could be the rivets in the output shaft. Not fatal, just somewhat annoying.


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"There's never enough time to do it right, but there's always time to do it over."

1988 K100RS SE VIN 01477554
    

5Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Sat Oct 14, 2017 10:13 pm

RicK G

RicK G
admin
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Check the inlet tract from the filter to the cylinder head for leaks. This can be done using an unlit propane torch and the gas will be drawn into the engine and a difference in running is noticed. All the clamps above and below the Injector body as well as the rubber stub manifolds at the cyl head are good places to start. If the engine is idling rough then that will cause rattles so check for air leaks first.


__________________________________________________
"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 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

6Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Mon Jun 22, 2020 2:43 pm

ExcelKebab

ExcelKebab
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New member
Thanks for alle the tips! I think I found the source of the knocking. For some reason, 5-6 teeth on the anti backlash gear were bent outwards, scraping against the aluminium casing of the engine block. Didn't manage to find a replacement anti backlash gear that cost less than an arm and a leg, so the solution was to sand down the outer/rear edges of the teeth so they rotate clear of the engine block. Hoping this will not significantly affect the weight balance of the gear and cause vibrations.
New K100RS owner from Norway Img-1410
New K100RS owner from Norway Img-1411
New K100RS owner from Norway Img-1412

    

7Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Mon Jun 22, 2020 2:51 pm

Arlina

Arlina
Moderator
Moderator
Welcome Excelkebab Smile

Got a bugger on your hand there Wink


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New K100RS owner from Norway Eu-log10  K1100RS/LT - R1200RT - R1100RS (RIP) - Cagiva SST 350 Ala Verde - K75LT project
    

8Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Mon Jun 22, 2020 2:58 pm

moriarti

moriarti
Life time member
Life time member
Maybe a machine shop with a press might be the answer,What could have caused this to happen in the first place scratch


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1984 k100 rs red/black VIN  0004449
    

9Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Tue Jun 23, 2020 7:35 am

ExcelKebab

ExcelKebab
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New member
The front bearing circlip seemed to be out of place when I disassembled the engine, so possibly the whole output shaft could have slid backwards causing the gear to catch the inner wall of the engine block. Or someone forgot a wrench in there at some point.. 
New K100RS owner from Norway 595960310

    

10Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Thu Jun 25, 2020 6:36 am

88

88
Life time member
Life time member
Excellent work to track that down. It's a very unusual thing to happen.

If that is an 8 valve bike you should consider upgrading the output shaft while you are in there to the later one with more rivets, they don't wear as badly as the 6 rivet one.

Oh and Welcome to the forum, good to have you with us!


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New K100RS owner from Norway Ir-log11 88....May contain nuts!New K100RS owner from Norway Ir-log11

"The world is a book and those who do not travel read only one page." - St. Augustine from 1600 years ago & still true!

Bike: K100LT 1988. 0172363. AKA the Bullion Brick! Mods: k1100 screen and stands.
K1: 1990. 6374189. Custom Stealth Black paint.
    

11Back to top Go down   New K100RS owner from Norway Empty Re: New K100RS owner from Norway on Thu Jun 25, 2020 6:57 am

ERasberg

ERasberg
Silver member
Silver member
Welcome to the forum. If you have a picture of the beauty don't hesitate to share. 

I have a similar knocking sound/ feel to what you describe. I never figured it out but also feels like it's coming from the drive shaft. 

Let new know if you want to meet up for a ride in the Oslo area. 

Cheers
Einar.


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Present
1988 K100 RS SE - VIN# 0146971K100RS - 105,000 km
1998 R1200C
1971 R75/5

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1999 Virago XV125
1981 R65
    

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