BMW K bikes (Bricks)

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

ExcelKebab

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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    Re: New K100RS owner from Norway on Sat Oct 14, 2017 4:18 pm

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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                              Paul  

"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    Re: New K100RS owner from Norway on Sat Oct 14, 2017 4:25 pm

ExcelKebab

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Thanks Paul!

    

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

club_c

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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    Re: New K100RS owner from Norway on Sat Oct 14, 2017 10:13 pm

RicK G

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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.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

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